Why Selenium Screenshot Results Can Be False After Capture
Selenium can save a valid PNG while the page is still changing. Learn why screenshots are blank, stale or wrong—and how to capture a verified state.
Engineering
Puppeteer, Playwright, Selenium and headless Chrome, and what they take to run well.
How to Reduce AVI File Size in a C# Screen Recorder
Reduce AVI recordings by choosing a supported encoder, resolution, frame rate and quality profile, or transcode existing files safely in C#.
How to Prevent PhantomJS Capybara Failures on Never-Ending Assets
Find whether Capybara, PhantomJS, or an asset is waiting forever, then fix the correct layer without hiding real browser failures.
Why PhantomJS Screenshots Do Not Render JavaScript Like Chrome
PhantomJS does run JavaScript, but its older WebKit engine and capture timing can produce different screenshots from Chrome.
Why HTML5 Canvas Screenshots Look Blurry and How to Fix Them
Canvas screenshots blur when the bitmap is smaller than its CSS size or export ratio. Fix Retina scaling, resizing, smoothing and image quality.
How to Speed Up Screenshot Capture with PhantomJS
Speed up PhantomJS screenshots by reducing page work, bounding waits, filtering resources, and measuring visual correctness before tuning further.
Why html2canvas Does Not Capture Paper.js Dialog Boxes
html2canvas rebuilds DOM content, while Paper.js draws on canvas. Learn how to identify the missing layer and choose the right capture method.
Why html2canvas Generates Blank Images in Ionic 4 Angular
Fix blank html2canvas images in Ionic 4 Angular by checking dimensions, CORS, rendering timing, canvas limits, and unsupported content.
Can HTML5 Canvas Capture a Screenshot of Any DOM Element?
No. Canvas cannot read arbitrary DOM pixels; html2canvas repaints accessible content with important origin, CSS, iframe, and size limits.
Why html2canvas Cannot Capture CAPTCHA Images and What to Do
html2canvas rebuilds the DOM instead of photographing the screen. Learn why CAPTCHA images disappear and which authorized fixes work.
Why html2canvas Produces Different Results on Each Click and How to Fix It
html2canvas rebuilds the DOM instead of capturing browser pixels. Learn why repeated clicks differ and how to make captures stable.
Why Android WebView Screenshots of Videos Are Blank and How to Fix Them
A WebView canvas snapshot can omit HTML5 video. Learn when to use hardware rendering, PixelCopy, or VirtualDisplay with SurfaceTexture.
Why canvas.drawImage Scaling Produces Blurry Results and How to Fix It
Learn why canvas.drawImage looks blurry, how to fix source scaling and high-DPI canvas rendering, and when to disable image smoothing.
Maximum Height of 16,384 Pixels for Headless Chrome Screenshots
The 16,384px Chrome screenshot cap was a historical backend limit. Learn why it happens, how to tile captures safely, and when to use an API.
Why Pyppeteer Chromium Stops Loading Pages After a While
Diagnose Pyppeteer pages that stop loading after 20 seconds: timeouts, waitUntil, sessions, Chromium versions, networks, and reliable fixes.
How to Convert HTML to an Image in a Node.js AWS Server
Render HTML in headless Chromium on AWS Lambda, capture a PNG or JPEG, and return it or store it in S3 with production safeguards.
How to Generate Images of Web Pages in a High-Performance Environment
Build fast, repeatable webpage screenshots with Playwright, tuned rendering settings, warm workers, and a production-ready API option.
Why Selenium Screenshot OutputType Uses Base64
Selenium returns PNG screenshots as Base64 because WebDriver defines a text wire format. Learn when to use BASE64, BYTES, or FILE in Java.