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Why a slider
Free before and after image comparison tool
imgi is a free online tool for comparing two images with a slider. Drop in a before and an after, drag the divider across the difference, and see exactly what changed: game mods and texture packs against vanilla, AI upscales and DLSS presets against their sources, photo edits against originals, renders, and compression tests.
Side by side screenshots hide small differences. A comparison slider puts both images in exactly the same place, so texture, sharpness, banding, and color shifts become obvious the moment you drag. When the difference matters, this is the fastest way to show it.
Every comparison becomes a permanent short link you can share with anyone. No account is needed, viewers get the same interactive slider with no app or signup, and you can embed it on your own site or export the pair as a GIF. Links stay yours: rename them, flip them private, or delete them whenever you want. Two files, one drag, one link to share.
Everything the link carries
the cards are live, go ahead
DuskSunriseThe slider your link opens
Everyone you share with gets this exact experience: both images in the same place, a divider to drag, labels that say which is which. No app, no signup, it just opens.
Offline mode: lossless, private
Compare two files entirely in your browser: no upload, no recompression, bit-exact originals. Nothing leaves your machine.
imgi.coEmbed on your own site
One iframe snippet and the working slider runs inside your blog, docs, or portfolio.
Ten images, one link
Host a whole test set in one comparison and swap any two into the slider with a dropdown.
Private publishing
Flip a link to private and only you can open it. Client work stays out of sight until it is ready.
GIF and video export
Turn any pair into a looping sweep for social feeds, chat apps, and READMEs where sliders cannot run.
Common questions
01Is imgi free?+
Yes. Uploading, comparing, sharing a permanent link, and embedding are all free with no signup.
02What image formats can I compare?+
PNG, JPG, WebP, and GIF. For the sharpest before/after, use two images of the same dimensions.
03Do my images stay online forever?+
Shared links are permanent while the tool is running. You can delete any upload at any time, and you can mark an upload private so only you can open it.
04Can I embed a comparison on my own site?+
Yes. Every comparison has an embed snippet that drops the slider straight into your page, sized to your image.
05Does imgi compress my images?+
Shared links serve visually-lossless AVIF and WebP so pages load fast, with full resolution on zoom. If you need bit-exact, use Offline mode: it compares two files entirely in your browser, with no upload and no recompression.