Prepare. Download. Post.
Platforms re-process almost every upload. UpPrep checks your export, remuxes it lossless with faststart, or re-encodes to a clean delivery spec — so what you exported is what people see.
Analyse, prepare, post.
Drop your video
Drag it in or browse. MP4 or MOV, straight from your editor or camera roll — up to 4K.
Prepare it
One pass in the studio. Spec check, lossless faststart remux, or a precise re-encode. Your file never leaves your device.
Post it
Download and upload on TikTok like any other clip. Nothing else in your workflow changes.
TikTok re-processes almost every upload. That’s where sharpness and frame rate often go. Start from a clean, standard file and more of your export survives.
The same edit,
two delivery paths.
Drag to compare a typical hard re-process (540p) against a Full HD source. Synced playback — judge the edges yourself.
Drag to compare
Why delivery settings matter
Odd frame rates, oversized bitrates, HDR tags and an index at the end of the file all push platforms into heavier processing. UpPrep fixes the container and the encode — not a fake filter.
What you get every time.
Deep analysis
Resolution, real fps, bitrate, profile, pixel format, colour tags, audio and moov position — in seconds.
Lossless faststart
Stream-copy remux with the index moved to the front. Packet hashes prove nothing in the video changed.
Pro re-encode
H.264 High or HEVC, yuv420p, BT.709, your bitrate — up to 4K60 when the source needs it.
Nothing leaves your device
Processing runs in WebAssembly on your machine. We only count exports against your subscription.
Live at a glance.
From people who post.
Questions people ask
Does my video get uploaded to your servers?
No. All processing runs in your browser with WebAssembly. We only receive a small record to count exports against your plan.
Will TikTok stop compressing my video?
No tool can promise that — every platform re-processes uploads. UpPrep makes the file you send as clean and standard as possible so processing starts from the best source.
What does “lossless” mean here?
Video and audio packets are copied byte-for-byte into a new MP4 with the index at the front. We hash packets before and after and show you the result.
Do I need to install anything?
No. Recent Chrome, Edge or Firefox on desktop is enough. Multithreading needs a cross-origin-isolated page, which UpPrep enables automatically.
How do subscriptions work?
Checkout runs on Payhip. After purchase, claim your personal activation key on the success page with your email and order ID. Unlimited uploads while the plan is active.