How to Compress an Image to 200KB Online
Learn how to compress a JPG, PNG, WebP or HEIC image to around 200KB in your browser without uploading the file to a server.
OnlineBox notes
Blog
Short guides, updates and practical notes for free browser tools.
HEIC to JPG: How to Convert iPhone Photos Online
Convert iPhone HEIC or HEIF photos to JPG, PNG or WebP in your browser without uploading the original image.
How to Convert Markdown to PDF in Your Browser
Convert Markdown to PDF with live preview, code highlighting, LaTeX math and custom PDF styles directly in your browser.
How to Format and Validate JSON Online
Format, validate, beautify and minify JSON in your browser, with common JSON syntax errors explained.
How to Remove PDF Copy and Print Restrictions
Learn how to remove PDF copy, print and edit permission restrictions locally in your browser without uploading the file.
Introducing OnlineBox — Free Browser-Based Tools That Respect Your Privacy
OnlineBox is a collection of free online tools that run entirely in your browser. No file uploads, no server processing, your data never leaves your device.