PDFLab
Private

Compress images online

Drag in JPG or PNG files and PDF Lab reduces their file size using smart browser-side compression. Set your quality target and download the optimised images — nothing is uploaded.

or drop files here

Tip: select multiple files with Ctrl/Cmd or drag many at once.

No uploadsNo signupNo watermarkNo trackingFree foreverWorks offline*

How to use Compress Images

  1. 1Click "Select images" and choose JPG, PNG, or WebP files from your device.
  2. 2Adjust the quality slider or pick a preset compression level for the output.
  3. 3Click Compress Images. The optimized files are processed locally and downloaded as a ZIP.

Why use PDF Lab

  • Reduce JPG, PNG, and WebP file sizes without visible quality loss.
  • Files stay on your device — nothing is uploaded to any server.
  • No account, no signup, no watermark on the output.
  • Free to use with no per-file limits beyond your device's memory.
  • Works on desktop and mobile browsers, including offline after first load.
  • Batch-process multiple images at once and download them all as a ZIP.

Your file never leaves your browser

Compress Images runs entirely on your device using pdf-lib and pdf.js — both self-hosted by PDF Lab, so no third-party CDN sees your traffic. There is no upload, no account, no log of your file.

How browser-based PDF processing works →

Compress Images — questions

Are my files uploaded to your server?+
No. Every operation runs in your browser using JavaScript. Your file is loaded into your browser's memory, processed, and a result is saved to your device. Nothing is sent over the network.
Can PDF Lab see the contents of my files?+
No. Because the processing happens in your browser, neither PDF Lab nor any third party has access to the file contents. You can verify this by opening your browser's network tab while using the tools — no file data is transmitted.
Are there file size limits?+
There is no enforced limit, but performance depends on your device's memory. Most modern browsers comfortably handle PDFs up to about 100 MB. Very large files may slow down your browser tab.
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