About ImageMint
A small set of free image tools that run entirely in your browser.
What ImageMint is
ImageMint is a free collection of image tools that run in a web browser. There is nothing to install, no account to create, and no file size tier to unlock. You open a page, drop in an image, and get your files back.
There are twelve tools, and they fall into four groups.
The Sprite Sheet Slicer cuts a sprite sheet into its frames, either on an even grid you set by hand or with Magic mode finding the boundaries for you; the Instagram Grid Splitter cuts one photo into 3×3, 3×2 or 3×1 square tiles named in posting order; and PDF to Image renders the pages of a PDF out as PNG or JPG files at 72, 150 or 300 DPI.
The Image Resizer takes a batch down to an exact pixel size or a percentage of the original; the Instagram Resizer does the same against the post, story, reels and profile sizes, showing you what gets cropped first; and the Pixel Art Upscaler scales sprites up by whole-number factors with nearest-neighbor sampling, so the edges stay hard instead of going soft.
The Image Converter moves files between PNG, JPG and WebP, and lets you pick the background color used when transparency has to be flattened; the Image Compressor either takes a quality setting or hunts for one that lands under a file size you name in KB; and Image to PDF combines a set of images into one document with a page order, page size and margins you choose.
The Sprite Sheet Generator packs loose images back into a single sheet and hands you the matching CSS, SCSS or JSON coordinates; the Favicon Generator turns one image into a multi-size favicon.ico, an apple-touch-icon, the manifest PNGs and the head snippet to paste in; and the Background Remover detects a flat backdrop from the corner pixels and makes it transparent, which is usually the step before any of the rest.
Why it exists
ImageMint started as one tool for slicing sprite sheets. That is why the source repository is still called gridslicer, and why the oldest page on the domain is a grid slicer. The other eleven tools are the chores that kept turning up around that one job: the sheet arrived with a background that had to come off, the frames needed repacking, the exported files were too heavy to ship, someone wanted the whole thing as a PDF. Each tool got built the week it was needed rather than planned in advance, which is why the set looks the way it does.
None of these chores needs a desktop application. The usual answer is to open Photoshop, GIMP, or Aseprite and do it by hand, which is a lot of setup for a task that takes ten seconds once it is set up correctly. Browsers have had the Canvas API for years, and it is more than capable of this work. ImageMint is what happens when you build those chores as web pages instead.
Half the tools still lean toward game art, and indie developers were the first people using them. The other half are not specific to anything: resizing a batch, getting a photo under an upload limit, turning scans into a PDF. If you work with images in quantity, something here probably fits.
How it is built
The site is a Next.js static export. There is no backend and there are no API routes — every tool is just a page, and the work is done by the Canvas API in the tab you already have open.
One piece of that deserves a plain explanation. The sprite-boundary detection behind Magic Slice — the part that guesses where one frame ends and the next begins — was written by Claude, an AI assistant. It was written by AI; it is not powered by AI. What actually runs when you press the button is ordinary code that walks the image's alpha channel looking for gaps. There is no model, no inference, and no network call anywhere in it, and the same image fed in twice will give you the same slices twice.
Your images stay on your machine
Every tool here processes images locally, in your browser, using the Canvas API. Your files are read by the page, worked on in memory, and written back out as downloads. They are never sent anywhere.
This is not a policy promise that could quietly change — it is how the site is built. ImageMint is a static site with no backend, no API routes, and no upload endpoint. There is no server that could receive your images even if someone wanted it to. You can verify this yourself: open your browser's network tab while you slice an image and watch that nothing leaves the page.
A practical side effect is that everything runs at the speed of your own hardware, and it keeps working on unreliable connections. The trade-off is that very large images are limited by your device's memory rather than by a server farm.
Who builds it, and how it is paid for
ImageMint is built and maintained by an independent developer. It is not a company product, and there is no team behind it — which means features arrive when they are ready rather than on a roadmap, and bug reports usually get read the same week.
The tools are free to use, with no paid tier and no usage limits. The site may show ads to cover hosting costs. Nothing is held back behind a signup, and there is no plan to start charging for the existing tools.
Tell me what is broken
Most improvements here started as someone describing a sprite sheet that would not slice cleanly. If a tool gets something wrong, or you need an export format or option that is missing, the contact page is the fastest way to reach me. Concrete examples help more than anything else.