A video editor that lives in your browser tab
PromptCut is a small video editor with a simple idea: editing should be quick, private and free. You get a studio-style toolbar for the everyday jobs, plus a prompt bar where you can type the change you want. Write “cut 0:10 to 0:30, speed 1.5x, black and white” and it does exactly that. Under the hood, your choices are turned into FFmpeg instructions, and FFmpeg, compiled to WebAssembly, performs the edit on your own device. There is no AI service behind it, no account to create, and no queue to wait in.
I built it for the jobs people actually have: trimming a clip before sending it on WhatsApp, adding a quick caption, turning a landscape video into a Reel with a blurred background, covering a small logo on your own footage, or shrinking a file that is too big to upload.
How to use it
- Pick your video: tap the box or drag a file in. Nothing is uploaded, the file is only read by your own browser.
- Choose a tool from the toolbar under the preview (Canvas, Trim, Filters, Remove Logo, Text, Music, Speed, Remix) and adjust the sliders or buttons.
- Or type commands in the Smart Prompt Bar, in English or Hinglish, separated by commas. The quick chips fill it in for you.
- Press “Edit video”. The first time, the editing engine (about 30 MB) is downloaded once and kept by your browser.
- Watch the progress bar. Longer or higher-resolution videos take more time because your own device does all the work.
- Preview the result, then download it. Not happy? Change the settings and run it again. Your original file is never touched.
A tip from experience: do one or two edits at a time while you are learning, check the “Here is what I understood” box, and then stack more tools once you trust the result.
What each toolbar tool does
- Canvas. One-tap presets for 9:16, 16:9, 1:1 and 4:5, with a centre crop, a blurred background or a solid colour.
- Crop & Zoom. Zoom in on part of the picture and move the zoomed area with two sliders.
- Trim. Sliders for start and end, plus a way to cut out a section from the middle.
- Filters. 2D cartoon, black and white, vintage, sepia, vivid, warm, cool, negative, plus brightness, contrast, saturation, vignette, film grain, pixelate, blur, sharpen and fades.
- Remove Logo. Drag the red box over a small logo, or use a corner preset.
- Text. Caption or watermark with colour, size, position, a dark box and optional start and end times.
- Audio. Mute, volume, background music from your device, microphone voice-over, bass boost, echo and loudness levelling.
- Speed. 0.5x to 3x, reverse, repeat, rotate, mirror, flip and compress.
- Merge. Join several clips into one video before the other edits are applied.
- Export. MP4 video, GIF, MP3 audio or a single PNG frame, at the resolution you choose.
- Remix. A gentle one-click transform for your own footage.
- Pro. Optional extras such as 1080p and 4K export, glitch, cinema bars, glow, voice tools and image stickers.
Supported prompt commands
You can write commands in English or Hinglish. Separate several commands in one line with commas. Examples are below.
Trim / Cut
Keep only the part you need. Times can be seconds or m:ss.
cut 0:10 to 0:30trim 5 to 150:10 se 0:25 tak kaat dofirst 10 seconds
Text & watermark
Add a caption anywhere on the frame. Say where (top, bottom, center) and, if you like, a colour.
add text Hello Worldwrite Breaking News at topred text Subscribe Nowwatermark MyChannel
Speed
Speed things up, slow them down, or go full slow motion.
speed 2xspeed 1.5xslow motionslow 0.25x
Audio
Mute the clip, change the loudness, or pull the audio out as an MP3.
muteawaaz bandvolume 200%extract audio mp3
Filters
Quick looks and corrections.
black and whitesepiavintagebrightencontrastblurfade in and out
Transform & resize
Rotate, mirror, change resolution, or crop to social formats (centre crop).
rotate 90flip horizontalmirrorresize 720pvertical 9:16square
Compress & convert
Shrink a file for WhatsApp or turn a clip into a GIF.
compressreduce sizeconvert to gifextract audio mp3
Creative effects
Reverse a clip, repeat it, or give it a stylised look.
reverseloop 3 timesnegativevignettefilm grainpixelatewarmcool2d cartoon
Audio extras & screenshot
Boost bass, add echo, even out loudness, or save one frame as a PNG image.
bass boostechonormalize audioscreenshotscreenshot from 0:05
Remove a logo
Blur out a corner logo. For exact placement, use the Remove Logo tool and drag the red box.
remove logo top rightremove logo bottom lefthide logo center
Why browser-based editing is safer
Most free online editors ask you to upload your video first. That means your family clip, your client footage or your unreleased reel sits on someone else's server, sometimes for days, and you have to trust their deletion policy. Here the file never leaves your device. It is read by the page, processed by code running in your tab, and handed back to you as a temporary link that disappears when you close the tab.
There are practical upsides too. No upload means no waiting on a slow connection, and no bandwidth bill for anyone. Once the engine is cached, the editor keeps working on patchy mobile data because only the first load needs the internet.
The honest trade-off is speed. Your phone or laptop is doing the work that a data-centre machine would do elsewhere, so a long 1080p clip will take a while. That is the price of privacy, and for short clips it is hardly noticeable.
Getting the best results
- Keep clips reasonable. Under a few minutes and a few hundred megabytes is the sweet spot, especially on phones.
- Cut first, then add effects. A trimmed clip processes much faster than a full recording.
- Frame for the centre. With “Crop to fill”, the video is scaled to fill the frame and the sides are trimmed evenly, so keep your subject in the middle. Use blur or colour padding to keep everything in view.
- GIFs are capped at 15 seconds unless you pick a shorter range yourself, because longer GIFs balloon in size.
- Need a smaller file? Combine Compress with “resize 720p”. It is usually the biggest single saving.
- Logo removal is a smoothing effect. It works well on small marks over simple backgrounds and less well on large or detailed ones.
All videos are processed locally in your browser and are never uploaded to our servers. The Creator Remix tool is meant for fair use and for transforming your own or properly licensed content. Please make sure you have the rights to any video you edit.
Frequently asked questions
Is it really free, and is there a daily limit?
It is free. There are no accounts, credits or daily caps, because nothing is processed on our side. The only limit is what your own phone or computer can handle.
Can I paste a YouTube, Instagram, Facebook, Reddit or Pinterest link to download a video?
No. Those services do not allow downloads outside their own features, and copying other people's videos can break copyright law, so we do not offer a downloader. If the video is yours, use the platform's own download or export option (for example YouTube Studio, or the data download tools in Instagram and Facebook), then edit the file here. You can also paste a direct https link to a file you own into the import box.
Do you upload or store my video?
No. Your file is read by your browser, edited in the same tab, and the result is a temporary link that exists only in your browser. Close the tab and it is gone. You can confirm this in your browser's network panel: no video bytes leave your device.
Why does the first edit take longer?
The first run downloads the FFmpeg engine, roughly 30 MB. Your browser caches it, so later edits start almost instantly. After that, speed depends on your device and the video resolution.
Is this AI? Will it understand any sentence?
It is not AI. The toolbar gives you direct controls, and the prompt bar is a rule-based reader that looks for known editing phrases in English and Hinglish. That makes it fast, predictable and free, but it also means it understands the commands listed above, not open-ended requests like "make it look cinematic". The “Here is what I understood” box shows exactly what it picked up.
How does logo removal work?
Open the Remove Logo tool, pick a corner preset or drag the red box over the logo, tick the checkbox and run the edit. The area is smoothed using FFmpeg's delogo filter. It works best on small, simple logos over plain backgrounds; it cannot magically rebuild a detailed picture behind a big watermark.
Can I add my own background music?
Yes. In the Music tool, choose an audio file from your device, set its volume and run the edit. The file is mixed into the video locally and never uploaded. Use only music you own or have a licence to use.
What video formats work?
MP4, MOV and WebM work best. MKV and several others work if your browser can read the file. The output is MP4 (H.264 and AAC), GIF or MP3, depending on what you ask for.
Why do I see an error on a very large file?
Browser editing keeps the file in memory. Phones in particular may run out of it with files over a few hundred megabytes. Try a shorter clip, or turn on Compress and add "resize 720p".
Can I add Hindi text on the video?
Not reliably yet. The built-in font (Roboto) covers Latin letters, so Hindi may appear as empty boxes. Hinglish written in English letters works fine.
Which browsers are supported?
Recent Chrome, Edge, Firefox and Safari. If editing stalls, tick “Compatibility mode” under Advanced and try again.