WebEdit Pro Help Documentation

A complete guide to WebEdit Pro, from opening a video to saving it. Open the editor

Last Updated: November 14, 2026

1. Getting Started

Drop a video on the editor or press Choose a video. The preview, the playback buttons and the timeline appear, with the tool groups beside them on a wide screen and under them on a phone: Video, Cut and trim, Look, Colour grading, Speed, Text and subtitles, Fades and transitions, Sound, Video layers, Green screen and Markers. Every change shows in the preview at once and can be undone. When the edit is ready, press Save video.

2. Opening a Video

WebEdit Pro opens videos of up to 500 MB that this browser can play, usually MP4, WebM and MOV. The Video group shows the file's name, size, picture size and length. A video recorded by a browser often lacks its length; WebEdit Pro reads it before you start. If a video does not open, the site's media converter can turn it into MP4 or WebM. Open another video replaces the open one; only one edit is kept in the browser, so save the project first if you want to come back to the first video.

3. The Preview and Playback

The preview is drawn the same way as the saved video: the kept clips in order, turned and cut to the shape, with the colour, the transitions, the layers, the texts, the subtitles and the fades. A click on the picture plays or pauses (with the Cut tool it splits), and texts can be dragged on it. Under the preview: play or pause, five frames and one frame back or forward (a frame step moves one picture of the video), the time, the speeds 0.5x to 2x, jumps to the start, 25%, 50%, 75% and the end, and buttons to add a marker or a subtitle. Playback jumps over the parts you removed and stops at the end of the last clip.

4. The Timeline

The timeline shows the whole video from left to right: markers on top, then the video row with small pictures and the clips you keep as boxes, then the sound row with the sound picture. The red line is the playhead. Click to move it, or drag across the empty part to scrub. Zoom in and out for detail (the timeline scrolls in its own box) and Fit to see it all. Thumbnails draws more pictures along the video (20 to 200, about one every 2 seconds), and Clear removes them.

5. Cutting and Trimming

• Split at playhead (S) cuts the clip under the playhead in two. It needs at least 0.1 seconds on each side.
• Choosing a clip: click a clip on the timeline (or Tab to it and press Enter). Delete chosen clip removes it; Clip starts here and Clip ends here move its start or end to the playhead.
• Dragging: drag the white ends of a clip to trim it, or its middle to slide it between its neighbours.
• The Cut tool (C): a click on the picture splits at the playhead; a click on a clip splits where you click.
• The Trim tool (T): two blue handles move the start and the end of the whole edited video.
• Selections: Start selection (I) marks the playhead, then End selection (Shift+E), a click on the timeline or pausing marks the other end. Trim to selection keeps only the selection; Delete selection removes it from every clip it touches.

6. Turning, Flipping and Shape

Turn left and Turn right turn the picture by a quarter; an upright video turned once becomes wide. Flip across and Flip upside down mirror it. Shape (in the Look group) keeps the middle of the picture in another shape: 16:9 widescreen, 9:16 upright, 1:1 square, 4:3 classic or 21:9 cinema, cutting the sides or the top and bottom. All of these are in the saved video too.

7. Brightness, Looks and Colour Grading

Brightness, Contrast and Saturation go from 0 to 200 percent (100 is the video as it is). The looks add a style on top: Grayscale, Sepia, Vintage, Cinematic, Cold, Warm and Noir; Original takes the look away. Colour grading has five sliders from -100 to 100: Warmth (cooler to warmer), Tint (green to magenta), Shadows, Midtones and Highlights. Double-click a slider to put it back. Reset the look and Reset the grading put each group back.

8. The Color Harmonizer

• Many clips: add up to 20 clips, press Measure all (five frames of each), then Harmonize: each clip gets its own brightness, contrast and saturation to reach the average of all of them. Download all records each clip with its new colour; Merge into one video records them one after another into one file, each kept whole in the first clip's shape, with its sound. Both take as long as the clips.
• Match a reference: add a reference video; your open video is measured too, and Match sets your video's brightness, contrast and saturation towards the reference.
• Automatic fixes: Basic fix (105, 110 and 105 percent), Smart fix (rules from your video's measured brightness and contrast at eight moments) and Cinema look (deeper contrast, softer colour, the Cinematic look and a warm grading). Show before compares; Reset the colour puts the colour back.
• Profiles: keep the current colour under a name, apply or delete kept profiles, and save or open a profiles file. Up to 50 profiles.

9. Text and Subtitles

A text has up to 200 characters, a colour and one of four sizes; it shows in the middle of the picture for the whole video. Drag it on the picture, or type the place of its middle in percent (X from the left, Y from the top). Long texts break into lines. Up to 50 texts. A subtitle has up to 200 characters and shows from the playhead for 0.5 to 30 seconds at the bottom of the picture, white on a dark box. Save subtitles writes the subtitles as an SRT file with the times of the saved video, after your cuts and at your speed (a subtitle that lies wholly in a removed part is left out); up to 500 subtitles.

10. Fades and Transitions

Fade in and Fade out (0 to 10 seconds) bring the whole saved video in from black and out to black, texts included. A transition belongs to a clip and plays as it begins, for 0.1 to 5 seconds: Fade through black (the last picture fades to black, then the clip fades in), Dissolve (the clip fades in over the last picture), Wipe (the clip is revealed from left to right) and Slide (the clip slides in from the right). The first clip's transition starts from black. Choose No transition and Apply to remove one. A transition cannot be longer than its clip.

11. Speed

Speed goes from 25 to 400 percent in steps of 25, also with the 0.5x to 2x buttons and the minus, plus and 0 keys. A speed ramp goes from one speed to another (0.25x to 4x) over 0.5 to 10 seconds of your video, starting at the playhead, then back to the speed above. The saved video's length follows, and the Save window shows it. The sound keeps its pitch.

12. Sound and Music

• The video's sound: Volume (0 to 100 percent), Mute and Normalize (the loudest moment brought to 1 dB below the top of the scale, at most ten times louder; it needs the sound picture, so a video of up to 300 MB and 30 minutes).
• Sound fades: set the seconds (0.5 to 10) and press Fade in or Fade out; they work on the whole mix at the start and end of the saved video.
• Music and other sound: Import sound adds a sound file of up to 200 MB that plays from the start of the saved video at its own speed, with its own volume and mute. Up to five.

Everything you hear in the preview is what is recorded into the saved video.

13. Video Layers and Green Screen

Add video layer draws another video over yours from the start of the saved video, without its sound, keeping its own shape. Each layer can be hidden, made see-through (Opacity), sized as a part of the picture's width (10 to 200 percent) and placed by its middle in percent. Up to five layers. Green screen makes a colour see-through in your layers: pick the colour with the colour box, set Similarity (how close a colour must be to disappear) and Smoothness (how soft the edge is), and press Turn green screen on.

14. Markers

Press M or Add a marker to put a marker at the playhead with a label of up to 50 characters and one of six colours. Markers show on the timeline and in the Markers group, where you can go to them or remove them; Shift+M and Shift+N go to the previous and next marker. Markers help you find places; they are not in the saved video.

15. Saving the Video

Save video opens a window with the preset, the size, the format and the file name, and shows the size in pixels and the length. Saving plays your edited video from start to end and records the preview as it plays, so it takes about as long as the saved video: a 5-minute video takes about 5 minutes. Every picture of the video is kept, at the video's own rate. Keep the tab open and in front; a hidden tab pauses the recording, which carries on when you come back. The Save window stays open until the video is saved; Cancel stops it without a file.

• Size: 720p, 1080p or 4K count the shorter side (1080p widescreen is 1920 x 1080, upright 1080 x 1920), or As the video is, which the window starts with; at most 3840 x 2160, both sides even.
• Format: MP4 where the browser can record it, otherwise WebM; the window says which before you start.
• Length: up to 30 minutes per saved video; trim a longer edit or save it in parts.
• Presets set a common shape and size for that one save, such as 9:16 at 1080 x 1920 for upright videos, and leave the shape of your edit as it is; they are examples, so check what a site asks for today.

16. Projects and Your Kept Edit

After your first change, your edit (not the video) is kept in this browser; open the same video again (the same name, size and length) and it is put back, with Start fresh to begin again. Only one edit is kept: changing another video replaces it. Save project writes the edit to a .veproj file, and Open project puts a project file's edit on the open video, or on the next video you open. Project files from the earlier WebEdit Pro open too. Video layers and imported sound are not kept. New project closes the video and removes the kept edit without reloading the page.

17. Keyboard and Accessibility

Tab reaches every button, box, clip and marker; choices in a group move with the arrow keys; changes are announced to screen readers. While you use the tool: Space play or pause, Left and Right one frame, minus, plus and 0 the speed, C and T the Cut and Trim tools, S split, I and Shift+E a selection, Delete the selection or the chosen clip, M a marker, Shift+M and Shift+N the previous and next marker, Ctrl+Z undo, Ctrl+Y redo, Ctrl+S save the project and ? this help. The keys work only while you use the tool and never take your browser's own shortcuts.

18. Privacy and Your Data

Your videos, pictures and sound files are opened, played, edited and recorded by this browser on your device; they are never sent to a server, and the tool asks no outside service for anything. The edit and the colour profiles are kept only in this browser's storage for this site. Like every page on ZeroDataUpload, the page carries ads and analytics, which load from the internet as described in the Privacy Policy.

19. How It Was Checked

The editor's engine was checked with 28,171 cases in 15 groups against references written separately: the clip operations and timings, the colour filters against the W3C Filter Effects definitions, the grading, green screen, the Color Harmonizer's measurements and corrections against the earlier version, sound levels, sizes, file names, subtitle files, the length written into WebM files, and thousands of damaged or crafted project files, kept edits and profiles. The page was checked in a browser with 185 checks, from opening, cutting and recording real videos to the layout on phones and computers.

20. Troubleshooting and Support

• My video does not open. The browser cannot play it; turn it into MP4 or WebM with the site's media converter.
• There is no sound while I play. Check Volume and Mute in the Sound group and your device's volume; some browsers start the sound only after you press Play.
• Saving is slow. It records in real time, so it takes as long as the saved video. Keep the tab in front.
• I asked for MP4 and got WebM. This browser cannot record MP4; the Save window says so before you start.
• My edit did not come back. It is kept per browser and device, only for the video it was made on, and not in a private window or after clearing the site's data.
• Green screen does nothing. It works on video layers: add the green-screen video with Add video layer.

For questions the FAQ does not answer, use the contact form.