OnlyJPG – Client-Side PNG/HEIC/AVIF/PDF/etc to JPG
TL;DR: private, in-browser converter that turns pretty much any image file format into standard JPEGs. Everything runs locally. No uploads. This started as a five-minute job and forty hours later... I wanted to convert a HEIC without uploading it anywhere, so I wrestled Emscripten/WebAssembly to run Google's Jpegli inside a Web Worker. Now there's a small UI and it handles a bunch of formats. Just about the only thing it can't decode is JXL - but there's still some JPEG XL magic in there: XYB perceptual color quantization is enabled by default via Jpegli. The upside of all this…
OnlyJPG – Client-Side PNG/HEIC/AVIF/PDF/etc to JPG launched on October 17, 2025 with 64 votes, #381 of 8,178 launches that month and more than 95% of that year's launches. The site was still online in September 2026, 1 year on.
In plain words
OnlyJPG is a browser-based image converter that transforms PNG, HEIC, AVIF, PDF, and other formats into standard JPEGs entirely on the user's device. All processing happens locally with no file uploads to servers, preserving privacy. The tool handles multiple image formats using Google's Jpegli engine compiled to WebAssembly, with perceptual color quantization enabled by default. It produces compatible JPEGs that work universally across platforms and devices.
written from the facts on this page · September 2026
From the sources
Free, local image converter. PNG, WebP, AVIF, HEIC, PDF, SVG, TIFF, TGA and more to JPG. 100% in-browser, nothing uploads.
anyjpg cannot run in this browser context. Required features are unavailable: No files were uploaded. Reload, or try another browser if this continues. Pick by what the picture is, not by a number. Web balanced is the default and suits a photograph going onto a page or into a message. Archival is the copy you keep: the most fidelity worth the bytes, with the ICC profile, Exif, XMP and DPI carried across. Screenshots & graphics is for flat colour, text and hard edges, where the colour detail a photograph can spare is exactly the detail that matters. Maximum compression is for a photograph that has to be small. Picking one moves only the controls it sets; anything you change afterwards stays…from onlyjpg.com
In the maker’s words, at launch
TL;DR: private, in-browser converter that turns pretty much any image file format into standard JPEGs. Everything runs locally. No uploads. This started as a five-minute job and forty hours later... I wanted to convert a HEIC without uploading it anywhere, so I wrestled Emscripten/WebAssembly to run Google's…
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Free JPEG XL Converter Jun 2026 · jpegxlconvert.com · ▲3Convert JXL, HEIC & more — free, private, in your browser
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