Privacy by design
Processing never leaves the browser. No cookies, no trackers, no hidden uploads — just local memory estimates and transparent cleanup.
100% browser-based GIF reversal
Reverse GIF Online — Fast & Private
Drop in any animated GIF and reverse it entirely on your device. Keep frame timing, loop count, and privacy while tracking every processing stage from upload to download.
- 10 MB / 300 frame GIF target in ≤12s median (desktop)
- Keeps per-frame delay & loop count exactly as uploaded
- Stage-based progress: Loading → Decoding → Reversing → Encoding → Preparing
- Built for private, no-upload workflows — everything stays local
Reverse a GIF right here
Drop a .gif file or choose from your device. We only read it in memory and never send it over the network.
Drop your GIF to reverse it
Drag & drop or click to choose · Up to 50 MB supported · Everything stays on this device
Selected GIF
- File name
- Dimensions
- --
- Frames
- --
- Size
- --
Stage progress
0%
- Loading Pending
- Decoding Pending
- Reversing Pending
- Encoding Pending
- Preparing Pending
Elapsed
00:00
Estimated remaining
--
Memory estimate
--
Lower config & retry
- • Scale longest edge to 480px
- • Cap frame rate at 30fps
Processing error
Why Reverse GIF Online
Single-purpose, production-grade GIF reversal
Designed from the PRD to nail one workflow: reverse a GIF without uploading it anywhere. Every UI element supports that promise.
Stage-based clarity
Users see five reversal stages with elapsed vs. projected time, fed by structured Worker messages and throttled updates (≤10Hz).
Resilient fallbacks
When memory is scarce, we offer “Lower config & retry” presets (scale + frame rate) that still respect loop and timing.
Workflow
From drag-and-drop to reversed download
Every reversal runs through a deterministic pipeline that mirrors the PRD’s stage names. Workers stream progress so users always know what’s happening.
Loading
Read the file, detect format, and estimate memory footprint before allocating buffers.
Decoding
Parse frames via gifuct-js depending on file size and browser support.
Reversing
Reverse the frame order and update timestamps while keeping the original loop count.
Encoding
Encode frames back into a GIF via gif.js while keeping original loop metadata intact.
Preparing
Generate blob, filename, and downloadable URL, then release worker memory.
Stage signals
Progress messaging for every frame
Worker events follow a consistent schema you can hook into for analytics or custom UI. Below is the contract shipped with MVP.
Event
Payload
Purpose
Fallback
progress_phase
{ phase, pct, elapsedMs }
Updates the UI progress bar and estimated time remaining.
Main thread increments a conservative fallback timer.
reverse_success
{ timeMs, sizeKb, frameCount }
Unlocks the download button and shows integrity summary.
If Worker dies, the main thread prompts a retry with lower config.
reverse_fail
{ phase, errorCode, estMemMb }
Surfaced as actionable error with downgrade presets.
Offers single-click “Lower config & retry”.
Performance targets
Built to hit the PRD’s KPIs
Benchmarks are continuously captured under throttled desktop and mobile profiles so you can trust the median numbers.
Desktop median
≤12s
10 MB / 300 frame / 640×360 GIF reversed end-to-end.
Mobile median
≤18s
Captured on 2024 mid-range Android & iOS Safari with Worker fallback.
Stability
<3% / <6%
Failure rate targets for desktop / mobile, aligned with PRD section 2.
FAQ
Answers for the most common reversal questions
Grounded in the PRD’s FAQ list so support and product stay aligned.
How do I reverse a GIF without uploading it?
Click “Start reversal”, choose your GIF, and let the Worker pipeline handle decoding, reversing, and encoding. Everything happens in-memory inside your browser — no data ever leaves the session.
What happens to frame delays and loop count?
We retain original delays and loop metadata, simply reversing the order of frames. The export summary reiterates delay preservation so you can verify timing.
Why might large GIFs fail?
High-resolution or long GIFs may exceed available memory. When estimates detect this, we propose lower-config presets (scaled dimensions、capped frame rate) before processing.
Can I cancel a reversal in progress?
Yes. The Worker listens for a cancel event which flushes memory, terminates encoding, and resets the UI so you can try again or adjust settings.
Ready to reverse your next GIF?
Spin up the Worker pipeline, track each phase, and download a perfectly reversed animation in seconds.
Compliance snapshot
- • No user-space breakage — reversed GIF preserves dimensions, loop, delays.
- • GDPR & CCPA aligned: no storage, no tracking, no cookies.
- • SLA-ready metrics: median throughput published in /en/blog/updates.