https://tcpdf.org
Lighthouse Desktop
· 0 checks — Desktop Lighthouse audit -- Performance, Accessibility, Best Practices, and SEO category breakdown.SCORE
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Detailed Report
Audit breakdown by category with detailed findings.
79
Performance
Insights
Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.
Why this matters
Performance issues directly impact user engagement and conversion rates.
Polyfills and transforms enable older browsers to use new JavaScript features. However, many aren't necessary for modern browsers. Consider modifying your JavaScript build process to not transpile Baseline features, unless you know you must support older browsers. Learn why most sites can deploy ES6+ code without transpiling
Why this matters
Performance issues directly impact user engagement and conversion rates.
3rd party code can significantly impact load performance. Reduce and defer loading of 3rd party code to prioritize your page's content.
Why this matters
Performance issues directly impact user engagement and conversion rates.
Consider setting font-display to swap or optional to ensure text is consistently visible. swap can be further optimized to mitigate layout shifts with font metric overrides.
Why this matters
Performance issues directly impact user engagement and conversion rates.
A forced reflow occurs when JavaScript queries geometric properties (such as offsetWidth) after styles have been invalidated by a change to the DOM state. This can result in poor performance. Learn more about forced reflows and possible mitigations.
Why this matters
Performance issues directly impact user engagement and conversion rates.
headings: [map[key:source label:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]
items: [map[reflowTime:34.72 source:map[column:339 line:99 type:source-location url:https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=ca-pub-2627887748647914 urlProvider:network]] map[reflowTime:0.666 source:map[column:389 line:67 type:source-location url:https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=ca-pub-2627887748647914 urlProvider:network]] map[reflowTime:0.168 source:map[column:425 line:181 type:source-location url:https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=ca-pub-2627887748647914 urlProvider:network]] map[reflowTime:1.343 source:map[column:24 line:137 type:source-location url:https://pagead2.googlesyndication.com/pagead/managed/js/adsense/m202604170101/show_ads_impl_fy2021.js urlProvider:network]] map[reflowTime:51.21 source:map[type:text value:[unattributed]]]]
Avoid chaining critical requests by reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.
Why this matters
Performance issues directly impact user engagement and conversion rates.
description: [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints help the browser establish a connection earlier in the page load, saving time when the first request for that origin is made. The following are the origins that the page preconnected to.
title: Preconnected origins
value: no origins were preconnected
description: Add [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints to your most important origins, but try to use no more than 4.
title: Preconnect candidates
A long cache lifetime can speed up repeat visits to your page. Learn more about caching.
Why this matters
Performance issues directly impact user engagement and conversion rates.
Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size
Why this matters
Performance issues directly impact user engagement and conversion rates.
| URL | Resource Size | Est Savings | |
|---|---|---|---|
Start Here div#layout > div#main > div.content > h2#start-here | /simgad/7569173843847414255/14763004658117789537?w=600&h=... | 54.8 KiB | 24.2 KiB |
Requests are blocking the page's initial render, which may delay LCP. Deferring or inlining can move these network requests out of the critical path.
Why this matters
Performance issues directly impact user engagement and conversion rates.
| URL | Transfer Size | Duration |
|---|---|---|
| tcpdf.org/css/combined.css | 21.5 KiB | 80 ms |
These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information.
Diagnostics
Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. Learn how to reduce unused JavaScript.
Why this matters
Performance issues directly impact user engagement and conversion rates.
Estimated savings: 170 ms 254.5 KiB
| URL | Transfer Size | Est Savings |
|---|---|---|
| /pagead/managed/js/adsense/m202604170101/show_ads_impl_fy... | 177.5 KiB | 114.8 KiB |
| /cse/static/element/dc329f57de078f5d/cse_element__en.js?u... | 102.7 KiB | 52.5 KiB |
| /i/ca-pub-2627887748647914?href=https%3A%2F%2Ftcpdf.org&e... | 68.7 KiB | 33.4 KiB |
| cse.google.com/adsense/search/async-ads.js | 43.3 KiB | 33.4 KiB |
| /pagead/js/adsbygoogle.js?client=ca-pub-2627887748647914 | 54.3 KiB | 20.4 KiB |
Minifying CSS files can reduce network payload sizes. Learn how to minify CSS.
Why this matters
Performance issues directly impact user engagement and conversion rates.
Estimated savings: 0.0 ms 3.3 KiB
| URL | Transfer Size | Est Savings |
|---|---|---|
| www.google.com/cse/static/element/dc329f57de078f5d/default_v6+en.css | 12.0 KiB | 3.3 KiB |
Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. Learn how to reduce unused CSS.
Why this matters
Performance issues directly impact user engagement and conversion rates.
Estimated savings: 0.0 ms 31.9 KiB
| URL | Transfer Size | Est Savings |
|---|---|---|
| tcpdf.org/css/combined.css | 21.4 KiB | 20.5 KiB |
| www.google.com/cse/static/element/dc329f57de078f5d/default_v6+en.css | 11.9 KiB | 11.5 KiB |
More information about the performance of your application. These numbers don't directly affect the Performance score.
●Time to Interactive 2.2 s
●Max Potential First Input Delay 80 ms
●Layout shift culprits
●Document request latency
●Optimize DOM size
●LCP breakdown
●Modern HTTP
●Optimize viewport for mobile
●Minify JavaScript
●Avoids enormous network payloads Total size was 1,185 KiB
●JavaScript execution time 0.4 s
●Minimizes main-thread work 0.9 s
●Avoid long main-thread tasks 1 long task found
●Image elements have explicit `width` and `height`
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 130 ms
●Server Backend Latencies 160 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Avoid multiple page redirects
●Initial server response time was short Root document took 160 ms
●Avoid large layout shifts 3 layout shifts found
○INP breakdown
○LCP request discovery
○User Timing marks and measures
○Avoid non-composited animations
92
Accessibility
These checks highlight opportunities to improve the accessibility of your web app. Automatic detection can only detect a subset of issues and does not guarantee the accessibility of your web app, so manual testing is also encouraged.
Contrast
Low-contrast text is difficult or impossible for many users to read. Learn how to provide sufficient color contrast.
Why this matters
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
Open Source PHP class for generating PDF documents div#layout > div#main > div.header > h2 |
tc-lib-pdf is the new generation of TCPDF for modern PHP. Generate production P… div#layout > div#main > div.content > p |
tc-lib-pdf div#main > div.content > p > strong |
TCPDF started in 2002 and became one of the most widely adopted PDF engines in … div#layout > div#main > div.content > p |
tc-lib-pdf div#main > div.content > p > code |
Install: div#main > div.content > ul > li |
GitHub: https://github.com/tecnickcom/tc-lib-pdf div#main > div.content > ul > li |
https://github.com/tecnickcom/tc-lib-pdf div.content > ul > li > a |
API docs: /docs/srcdoc/tc-lib-pdf div#main > div.content > ul > li |
/docs/srcdoc/tc-lib-pdf div.content > ul > li > a |
Examples: /examples/ div#main > div.content > ul > li |
/examples/ div.content > ul > li > a |
Packagist: https://packagist.org/packages/tecnickcom/tc-lib-pdf div#main > div.content > ul > li |
https://packagist.org/packages/tecnickcom/tc-lib-pdf div.content > ul > li > a |
tc-lib-pdf is a deterministic, pure-PHP PDF toolkit with no external rendering … div#layout > div#main > div.content > p |
tc-lib-pdf div#main > div.content > p > code |
Modern baseline: PHP 8.1+, Composer-first, modular dependencies. div#main > div.content > ul > li |
Modern baseline: div.content > ul > li > strong |
Production features: advanced typography, graphics, security, standards, and fo… div#main > div.content > ul > li |
Production features: div.content > ul > li > strong |
Predictable output: deterministic generation suitable for invoices, reports, la… div#main > div.content > ul > li |
Predictable output: div.content > ul > li > strong |
Flexible adoption: use the full stack or install only the tc-lib packages your … div#main > div.content > ul > li |
Flexible adoption: div.content > ul > li > strong |
The legacy TCPDF repository is deprecated: div#layout > div#main > div.content > p |
Legacy library: https://github.com/tecnickcom/TCPDF div#main > div.content > ul > li |
https://github.com/tecnickcom/TCPDF div.content > ul > li > a |
New library: https://github.com/tecnickcom/tc-lib-pdf div#main > div.content > ul > li |
https://github.com/tecnickcom/tc-lib-pdf ul > li > strong > a |
Recommendation: div#main > div.content > p > strong |
Starting a new project: use tc-lib-pdf. div#main > div.content > ul > li |
tc-lib-pdf div.content > ul > li > strong |
Running legacy TCPDF in production: keep it stable short-term and plan phased m… div#main > div.content > ul > li |
Migration matters because tc-lib-pdf is where active evolution continues. div#layout > div#main > div.content > p |
PHP 8.1+ div#main > div.content > ul > li |
Composer div#main > div.content > ul > li |
Optional extensions: gd, zlib div#main > div.content > ul > li |
gd div.content > ul > li > code |
zlib div.content > ul > li > code |
Invoices, receipts, and financial statements div#main > div.content > ul > li |
Shipping labels and barcode-driven logistics documents div#main > div.content > ul > li |
Compliance and archival PDFs (including PDF/A workflows) div#main > div.content > ul > li |
Branded reports with custom fonts, SVG, and advanced layout controls div#main > div.content > ul > li |
Interactive documents with forms, annotations, and signatures div#main > div.content > ul > li |
Full UTF-8 Unicode and right-to-left language support div#main > div.content > ul > li |
TrueTypeUnicode, OpenTypeUnicode v1, TrueType, OpenType v1, Type1, and CID-0 fo… div#main > div.content > ul > li |
Font subsetting for smaller files div#main > div.content > ul > li |
TeX-style language-aware hyphenation, optional zero-width breakpoints, and trac… div#main > div.content > ul > li |
Text rendering modes: fill, stroke, and clipping div#main > div.content > ul > li |
Automatic line breaks, page breaks, and justified text div#main > div.content > ul > li |
Standard and custom page sizes, margins, and measurement units div#main > div.content > ul > li |
HTML and CSS rendering div#main > div.content > ul > li |
SVG rendering div#main > div.content > ul > li |
Multi-column layouts and no-write page regions div#main > div.content > ul > li |
Headers, footers, reusable page content, bookmarks, named destinations, and tab… div#main > div.content > ul > li |
Automatic page numbering, page groups, page box control, and page reordering div#main > div.content > ul > li |
Native JPEG, PNG, and SVG support div#main > div.content > ul > li |
Extended image support through optional GD formats div#main > div.content > ul > li |
Geometric drawing and 2D transformations div#main > div.content > ul > li |
Linear/radial and mesh gradients, crop marks, and registration bars div#main > div.content > ul > li |
ICC profiles, grayscale/RGB/CMYK/spot colors, transparency, and overprint contr… div#main > div.content > ul > li |
Password and certificate-based encryption (RC4 and AES up to 256-bit) div#main > div.content > ul > li |
Digital signatures: detached CMS (PKCS#7) signatures with configurable appearan… div#main > div.content > ul > li |
RFC 3161 TSA timestamps embedded in CMS signatures with configurable digest, po… div#main > div.content > ul > li |
LTV (Long-Term Validation) embedding in the same PDF revision: /DSS, /VRI, /OCS… div#main > div.content > ul > li |
/DSS div.content > ul > li > code |
/VRI div.content > ul > li > code |
/OCSPs div.content > ul > li > code |
/CRLs div.content > ul > li > code |
/Certs div.content > ul > li > code |
Rich annotations: links, notes, attachments, markup, widgets, and media div#main > div.content > ul > li |
JavaScript embedding div#main > div.content > ul > li |
PDF/A (1/2/3 with a/b/u conformance levels) and PDF/X support div#main > div.content > ul > li |
1D and 2D barcodes through tc-lib-barcode div#main > div.content > ul > li |
tc-lib-barcode div.content > ul > li > code |
Interactive AcroForm fields div#main > div.content > ul > li |
XObject templates and layers with visibility controls div#main > div.content > ul > li |
Multiple output targets: browser display, download, file save, and MIME attachm… div#main > div.content > ul > li |
Factur-X / ZUGFeRD workflows via embedded XML in PDF/A-3 div#main > div.content > ul > li |
tc-lib-pdf is built on a set of focused, independently versioned packages. Each… div#layout > div#main > div.content > p |
tc-lib-pdf div#main > div.content > p > code |
tc-lib-pdf : Top-level PDF generation library; composes the full package stack. div#main > div.content > ul > li |
tc-lib-pdf div.content > ul > li > strong |
tc-lib-barcode : Generates 1D and 2D barcodes (QR, Data Matrix, Code 128, and … div#main > div.content > ul > li |
tc-lib-barcode ul > li > strong > a |
tc-lib-color : Color conversion and management across RGB, CMYK, HSL, and spot… div#main > div.content > ul > li |
tc-lib-color ul > li > strong > a |
tc-lib-file : File and data-URI helpers used internally for asset loading. div#main > div.content > ul > li |
tc-lib-file ul > li > strong > a |
tc-lib-unicode : Unicode string processing: bidirectional text, normalization,… div#main > div.content > ul > li |
tc-lib-unicode ul > li > strong > a |
tc-lib-unicode-data : Raw Unicode character data tables used by tc-lib-unicode. div#main > div.content > ul > li |
tc-lib-unicode-data ul > li > strong > a |
tc-lib-pdf-encrypt : PDF encryption: RC4 and AES (up to 256-bit), permissions,… div#main > div.content > ul > li |
tc-lib-pdf-encrypt ul > li > strong > a |
tc-lib-pdf-filter : PDF stream filters: FlateDecode, ASCII85, LZW, and others. div#main > div.content > ul > li |
tc-lib-pdf-filter ul > li > strong > a |
tc-lib-pdf-font : Font loading, subsetting, and embedding for all supported fo… div#main > div.content > ul > li |
tc-lib-pdf-font ul > li > strong > a |
tc-lib-pdf-graph : Vector graphics primitives: paths, transformations, gradien… div#main > div.content > ul > li |
tc-lib-pdf-graph ul > li > strong > a |
tc-lib-pdf-image : Image loading and embedding: JPEG, PNG, SVG, and GD-backed … div#main > div.content > ul > li |
tc-lib-pdf-image ul > li > strong > a |
tc-lib-pdf-page : Page geometry, margins, boxes, and page-level attributes. div#main > div.content > ul > li |
tc-lib-pdf-page ul > li > strong > a |
tc-lib-pdf-parser : Reads and parses existing PDF files for import or manipula… div#main > div.content > ul > li |
tc-lib-pdf-parser ul > li > strong > a |
Keep legacy TCPDF stable in production while planning migration. div#main > div.content > ol > li |
Start new features on tc-lib-pdf. div#main > div.content > ol > li |
tc-lib-pdf div.content > ol > li > code |
Move legacy document flows incrementally: one template, one module, or one serv… div#main > div.content > ol > li |
Validate outputs with your existing PDF regression checks. div#main > div.content > ol > li |
Read the documentation div#main > div.content > ul > li |
documentation div.content > ul > li > a |
Explore examples div#main > div.content > ul > li |
examples div.content > ul > li > a |
Try signature examples: /examples/007_example_signature_basic/, /examples/008_e… div#main > div.content > ul > li |
/examples/007_example_signature_basic/ div.content > ul > li > a |
/examples/008_example_signature_timestamp/ div.content > ul > li > a |
/examples/009_example_signature_ltv/ div.content > ul > li > a |
Browse project packages on /projects/ div#main > div.content > ul > li |
/projects/ div.content > ul > li > a |
View source and contribute on GitHub div#main > div.content > ul > li |
GitHub div.content > ul > li > a |
If this project helps your work, please consider supporting development via Pay… div#layout > div#main > div.content > p |
PayPal div#main > div.content > p > a |
© 2004-2026 – Nicola Asuni - Tecnick.com - All rights reserved. body > div#layout > div.footerbar > span.copyright |
Nicola Asuni div#layout > div.footerbar > span.copyright > a |
Tecnick.com div#layout > div.footerbar > span.copyright > a |
about - disclaimer - privacy div#layout > div.footerbar > span.copyright > a |
Low-contrast text is difficult or impossible for many users to read. Link text that is discernible improves the experience for users with low vision. Learn how to make links distinguishable.
Why this matters
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
/projects/ div.content > ul > li > a |
GitHub div.content > ul > li > a |
PayPal div#main > div.content > p > a |
These are opportunities to improve the legibility of your content.
Best practices
One main landmark helps screen reader users navigate a web page. Learn more about landmarks.
Why this matters
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
html html |
These items highlight common accessibility best practices.
○Interactive controls are keyboard focusable
○Interactive elements indicate their purpose and state
○The page has a logical tab order
○Visual order on the page follows DOM order
○User focus is not accidentally trapped in a region
○The user's focus is directed to new content added to the page
○HTML5 landmark elements are used to improve navigation
○Offscreen content is hidden from assistive technology
○Custom controls have associated labels
○Custom controls have ARIA roles
●`[aria-*]` attributes match their roles
●`[aria-hidden="true"]` is not present on the document `<body>`
●`[role]`s have all required `[aria-*]` attributes
●`[role]` values are valid
●`[aria-*]` attributes have valid values
●`[aria-*]` attributes are valid and not misspelled
●Buttons have an accessible name
●Image elements have `[alt]` attributes
●Form elements have associated labels
●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
●ARIA attributes are used as specified for the element's role
●`[aria-hidden="true"]` elements do not contain focusable descendents
●Elements use only permitted ARIA attributes
●Document has a `<title>` element
●`<frame>` or `<iframe>` elements have a title
●`<html>` element has a `[lang]` attribute
●`<html>` element has a valid value for its `[lang]` attribute
●Links have a discernible name
●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements
●No element has a `[tabindex]` value greater than 0
●Touch targets have sufficient size and spacing.
●Heading elements appear in a sequentially-descending order
●Deprecated ARIA roles were not used
○`[accesskey]` values are unique
○`button`, `link`, and `menuitem` elements have accessible names
○Elements with `role="dialog"` or `role="alertdialog"` have accessible names.
○ARIA input fields have accessible names
○ARIA `meter` elements have accessible names
○ARIA `progressbar` elements have accessible names
○Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
○`[role]`s are contained by their required parent element
○Elements with the `role=text` attribute do not have focusable descendents.
○ARIA toggle fields have accessible names
○ARIA `tooltip` elements have accessible names
○ARIA `treeitem` elements have accessible names
○The page contains a heading, skip link, or landmark region
○`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.
○Definition list items are wrapped in `<dl>` elements
○ARIA IDs are unique
○No form fields have multiple labels
○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.
○Input buttons have discernible text.
○`<input type="image">` elements have `[alt]` text
○The document does not use `<meta http-equiv="refresh">`
○`<object>` elements have alternate text
○Select elements have associated label elements.
○Skip links are focusable.
○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
○`[lang]` attributes have a valid value
○`<video>` elements contain a `<track>` element with `[kind="captions"]`
○Tables have different content in the summary attribute and `<caption>`.
○All heading elements contain content.
○Uses ARIA roles only on compatible elements
○Image elements do not have `[alt]` attributes that are redundant text.
○Identical links have the same purpose.
○Elements with visible text labels have matching accessible names.
○Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.
○`<td>` elements in a large `<table>` have one or more table headers.
100
Best Practices
●Uses HTTPS
●Avoids deprecated APIs
●Avoids third-party cookies
●Allows users to paste into input fields
●Avoids requesting the geolocation permission on page load
●Avoids requesting the notification permission on page load
●Displays images with correct aspect ratio
●Serves images with appropriate resolution
●Page has the HTML doctype
●Properly defines charset
●No browser errors logged to the console
●No issues in the `Issues` panel in Chrome Devtools
●Ensure CSP is effective against XSS attacks
●Use a strong HSTS policy
●Ensure proper origin isolation with COOP
●Mitigate clickjacking with XFO or CSP
●Mitigate DOM-based XSS with Trusted Types
●Page has valid source maps
○Redirects HTTP traffic to HTTPS
○Detected JavaScript libraries
100
SEO
These checks ensure that your page is following basic search engine optimization advice. There are many additional factors Lighthouse does not score here that may affect your search ranking, including performance on Core Web Vitals. Learn more about Google Search Essentials.
○Structured data is valid
●Page isn’t blocked from indexing
●Document has a `<title>` element
●Document has a meta description
●Page has successful HTTP status code
●Links have descriptive text
●Links are crawlable
●robots.txt is valid
●Image elements have `[alt]` attributes
●Document has a valid `hreflang`
●Document has a valid `rel=canonical`