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…
Does a similar job
all alternatives →
Free JPEG XL Converter Jun 2026 · jpegxlconvert.com · ▲3Convert JXL, HEIC & more — free, private, in your browser
HEIC to PDF2025 · heic-to-pdf.xyz · ▲12I've developed a pure client-side HEIC to PDF conversion tool to solve compatibility issues for iPhone/iOS users. Tech stack: Next.js 15.2.5 React 19 + TypeScript heic2any for format conversion jspdf for PDF generation Internationalization support (next-intl) All processing happens in the browser with no server uploads required, protecting user privacy. Features include batch conversion, real-time preview, custom PDF settings, and options to convert to PNG/JPG formats. This is an open project, and feedback/contributions are welcome. If you've encountered HEIC compatibility…
heicconvert.it2025 · heicconvert.it · ▲12I built heicconvert.it — a fast, private, and completely browser-based HEIC/HEIF image converter that supports output conversion to JPEG, PNG, WebP, or even AVIF. Why I made it: - Photos from iPhones often come in HEIC format, which isn’t broadly supported everywhere. - Existing tools tend to require uploads, compromise privacy, or feel clunky. - I wanted a zero-friction, client-side tool where conversion happens instantly, in your browser, without ever touching a server. Try it - https://www.heicconvert.it - No signup, no tracking, and no data is sent to anyone. What’s…
More work this month
the category →
Endless lofi beats composed live in your browser, over pixel-art nights in Paris, Tokyo, New York, Hong Kong, Sydney, San Francisco and more. Free, no sign-up.
Work · 26d ago · loficities.com
Smooth Recorder▲257Mac screen recordings that look edited when you hit stop
Work · 20d ago · smoothrecorder.com
Work · 15d ago · readrare.com
Source: Show HN post ↗ · launch text quoted in part
Launched alongside, October 2025
the whole month →
I went down the rabbit hole on a side project and ended up building this: Strange Attractors(https://blog.shashanktomar.com/posts/strange-attractors). It’s built with three.js. Working on it reminded me of the little "maths for fun" exercises I used to do while learning programming in early days. Just trying things out, getting fascinated and geeky, and being surprised by the results. I spent way too much time on this, but it was extreme fun. My favorite part: someone pointed me to the Simone Attractor on Threads. It is a 2D attractor and I asked GPT to extrapolate it to…
AI · Oct 2025 · blog.shashanktomar.com
Autism Simulator▲779Hey all, I built this. It’s not trying to capture every autistic experience (that’d be impossible). It’s based on my own lived experience as well as that of friends on the spectrum. I'm trying to give people a feel for what masking, decision fatigue, and burnout can look like day-to-day. That’s hard to explain in words, but easier to show through choices and stats. I'm not trying to "define autism". I’ve gotten good feedback here about resilience, meds, and difficulty tuning. I’ll keep tweaking it. If even a few people walk away thinking, "ah, maybe that’s why my coworker struggles in those…
Life & fun · 2025 · autism-simulator.vercel.app
