On the timeline
| Clip body | Drag to move it, along the track or onto another one. |
| Clip ends | Drag to trim. The clip gets shorter; nothing is thrown away. |
| Top corners | The small squares set a fade. The white ramp drawn across the clip shows how long it is and which way it goes. |
| Track name | Double-click to rename it. Enter keeps the change, Esc abandons it. |
| Amber diamonds | When a clip animates, these are its two marks. Click one to choose which position you are setting - it turns white. Drag it to change when the move starts or finishes. |
| Track order | Drag a header, or use its arrows. The top track draws in front. |
| Duplicate a track | The copy button in the header. The copy lands directly below the original with all its clips, crops, filters and fades intact. |
Handles on the preview
The handles and the Inspector sliders change the same numbers. Use
whichever suits the moment - handles to rough something in, sliders when
you want an exact value or are working from the keyboard.
| Inside the box | Drag to move. Hold Shift to snap back to center. |
| Corner square | Resize evenly. The clip keeps its proportions. |
| Mirror | Horizontal and vertical flips live in the Picture section. They are applied after any rotation, so flipping a tilted clip mirrors what you can see. |
| Edge bar | Crop that edge. The opposite edge stays where it is. |
| Stem handle | Rotate. Hold Shift for 15° steps; it snaps to square on its own near 0, 90 and 180°. |
The Inspector
Sections collapse, and only one is open at a time - with this many
controls a single long scroll meant the thing you wanted was never on
screen. Whichever section you last opened stays open as you move between
clips, so working through several of them adjusting color does not mean
reopening COLOR every time. A blue dot on a closed section means
something in there has been changed from its default, and the
? beside a heading explains what that section does.
Sizing and cropping
| Contain | Fits the whole picture inside the frame. Bars appear if the shapes differ. |
| Cover | Fills the frame completely. Whatever hangs over the edge is cut off. |
| Stretch | Squashes the picture to the frame exactly. Distorts it, but occasionally useful. |
| Crop to frame shape | Trims evenly from opposite edges until what is left matches the project shape. This is how you get a wide photo into a vertical video without bars. |
| Trim sliders | Cut into each edge by hand. Nothing is written to your file - cropping just narrows the window we look through. |
Shapes and shadows
| Rectangle | The whole picture, with a corner radius if you want one. |
| Square / Circle | Takes the shorter side of the picture for both dimensions, so a circle is a true circle and never an oval. Move the picture underneath to choose what sits inside it. |
| Drop shadow | Follows whatever shape you chose, corners and circles included. Softness and offsets are percentages of the frame, so they look the same at every export size. |
Speed
The Speed section keeps the same piece of footage and changes how long
it takes to play, so the clip gets shorter or longer on the timeline
while showing exactly the frames it showed before.
| Speeding up | Leaves a gap where the clip used to end. Nothing else moves - which is the point, because sliding this track would knock it out of sync with the others. A Close the gap button appears when there is one to close, and it only ever moves clips on that same track. |
| Slowing down | The clip grows, and whatever follows it on that track is pushed along to make room. Nothing is trimmed or lost. |
| Sound | Pitch moves with speed, the way a tape machine does. The preview and the exported file always agree. |
| On the clip | Anything not running at normal speed carries a small badge like 2× in its corner. |
| Range | A quarter speed up to four times. Beyond that browsers decode unreliably and the sound falls apart. |
| Exporting | A .videdtr project keeps speed exactly. Premiere and Resolve XML carries it as a Time Remap; an EDL carries it as an M2 record. |
Moving a clip while it plays
Select a clip and turn on Motion in the Inspector. Pick
Start pose, drag the picture where it should begin; pick
End pose, drag it where it should finish. It travels between the
two amber diamonds on the clip, which you can drag to change the timing.
This is how you slide a webcam inset out of the way to reveal what is
behind it, without cutting the clip in two and having it jump.
Hiding something: Blur
Add → Effects - Highlight → Blur adds a blur region on an
Effects track. It hides whatever is on the tracks below it, so drag the
track up or down to choose what it covers. Drag the handles on the preview
to place it, and round the corners all the way to get a circle. The
strength slider has a floor: the weakest setting is still a real blur, so
it cannot be turned off by accident. Blur the whole frame
in the Inspector stretches it over the entire picture.
Pointing at something: Spotlight and Magnifier
Two more effects in the Highlight group work on one
area, which you place with the handles on the preview just like a blur.
Spotlight dims everything outside the area (and can blur
it too), with a soft or hard edge and an ellipse or rectangle shape.
Magnifier is a zoomed-in lens, like IMGEDTR's: by default
it enlarges whatever is under it, or switch Magnify to another
spot and a thin line joins the lens to what it is showing. Both can be
moved over time: split the effect clip and place each piece.
Moments: countdown, confetti, fireworks and hearts
The Moments group, brought over from SCRNCSTR, plays once
from the start of its clip. Countdown 3-2-1 is a film
leader - a beat of black, then 3, 2, 1 with a sweeping hand - and covers
the picture, so put it before the first shot. Confetti
bursts and tumbles down, Fireworks climb and burst, and
Hearts float up and fade. The Amount slider sets how
many. Like the other effects, they are worked out from the frame number,
so the export matches the preview exactly.
Sound effects
Add → Sound effects puts a sound at the playhead.
Reactions are SCRNCSTR's five recordings: Applause,
Laugh track, Ta-da, Sad trombone and Rimshot. Cues are
made by VIDEDTR itself: Ding, Pop, Whoosh, Sparkle, Drumroll, Camera
shutter and Countdown beeps. Sounds go on their own Sound FX tracks,
never on your voice-over or music; a second sound effects track appears
only when two sounds would overlap. Each is an ordinary audio clip, so
move, trim and fade it as usual, and set its volume under Sound in the
Inspector. All of them are built into VIDEDTR, so there are no files to
keep track of: they sit in a Sound effects folder in the Media Pool, and
a saved project brings them back by itself when it is opened. Countdown beeps line
up with the Countdown 3-2-1 effect when the two start at the same moment.
Text, Color and Effects tracks
Besides video and audio there are three more kinds of track, each
labeled on its track head. Text tracks hold captions
(T, or Add → Text track) and go in front.
Color tracks hold color clips (N, or Add
→ Color track) and go at the back, so a color clip shows through a
gap in your footage as a slate, or sits behind a title. Move either
track up or down to change that. Effects tracks hold
effects, blur included.
Transitions
Wherever two clips touch, a small round + sits on the
join at the bottom of the track. Press it for a menu of transitions:
cross dissolve, dip to black or white, wipe, push, iris and zoom. Once a
cut has one, the button shows its icon; press it again to change or
remove it. Length, and the direction of a wipe or push, are under
Transitions in the Inspector. D puts a cross dissolve on the
cut nearest the playhead.
Looks: camcorder, VHS, old film and more
Add → Effects - Looks puts an effect at the playhead, on an
Effects track at the front. Like a blur, it changes everything on the
tracks below it, for as long as the effect clip lasts - drag its
ends on the timeline to set that, and drag the Effects track down to keep
a caption above it untouched. Camcorder adds a viewfinder frame, a
blinking REC light, a running counter and a date stamp. VHS tape bleeds
the colors, adds scan lines and tape noise, and glitches every now and
then. Shaky cam makes it look handheld: a gentle wobble, a walking
bob, or an earthquake, zoomed in just enough that the edges never show.
Old film tones the picture sepia or black and white and adds
flicker, scratches and dust. There are also Vignette, Film grain and
Letterbox. Choose and tune the effect in the Inspector; Opacity &
fades mixes it in and out, and the eye on the track header switches it
off for a quick before-and-after.
Color
Video and image clips get a COLOR section in the Inspector: eight one-click
looks, then sliders for brightness, contrast, saturation, black and white,
hue and blur. The graphics card applies these while drawing, so the preview
and the export are the same thing rather than two guesses at it. A clip
with color adjusted carries a small wand badge on the timeline.
Light and dark
The sun/moon button switches between them, and your choice is remembered
for next time. Until you press it the app follows whatever your
operating system is set to, and keeps following it - so if your machine
switches over in the evening, this does too. Pressing the button once
means you have an opinion, and it is honored from then on.
Both themes are built to WCAG 2.2 AAA contrast (7:1) for body text.
The video itself is unaffected: exports look identical either way.
Zooming the preview
The pill in the corner of the preview zooms from 25% to 300%. The two
halves of that range do different jobs, which is worth knowing:
| Below 100% | Shows the area around the frame, so you can find a clip you have pushed off the edge. The frame is the solid part; the gray checkerboard is everything that will not be in the video, and a dashed outline marks the boundary. |
| Above 100% | Magnifies, for checking exactly where two things overlap or how close a caption sits to an edge. It stops at 300%, which is where a 1080p frame runs out of real detail. |
| Slider | Drag for a big change; the − and + buttons step by a quarter each press. |
| Wheel | Ctrl (or Cmd) and scroll zooms towards the pointer. On a trackpad, pinch does the same thing. Plain scrolling pans, once there is something to pan to. |
| Full screen | The last button in the pill, or F. Gives the frame the whole display and starts playing: no handles, no checkerboard, no zoom - just the video, at the size you are going to watch it. Click to pause, Esc to come back. |
| Panning | Drag any empty part of the stage. Over a clip the drag belongs to the clip, so use the middle mouse button there - or pinch and drag on a touchscreen. |
| Fit | Back to 100% and centered. |
None of this touches the video. Zoom and pan are a magnifying glass over
the preview; the exported file is identical whatever you leave them set to.
Changing the shape of the whole project
Project settings (the cog, top right) → Verticalize 9:16 turns a landscape edit into
a tall one: the canvas changes and every clip is centered and cropped to
fill it. Centering is only a starting point - split each clip where the
action moves and set Position X on the pieces to follow it, or use Motion
to pan between two points. Square and Widescreen work the same way.
To change only the canvas, without refitting anything, pick a
Shape at the top of Project settings (or type a width
and height of your own) and press Apply.
Four ways out
| Video file | Renders the finished thing to .mp4, or .webm where H.264 is unavailable. The cut is baked in. |
| Project file | A .videdtr: your edit and, unless you switch it off, the media files themselves, in one file you can open here on any computer. (Older .vidproj files still open; they ask you to point at the media again.) |
| Premiere / Resolve | Final Cut Pro 7 XML. Tracks, cuts and source ranges transfer frame-accurately; effects are best-effort. Both applications have read this format for years. |
| EDL | One track of straight cuts as plain text. No effects, but readable by essentially every editing system ever made. |
Known limits
- Export needs the WebCodecs API. Chrome and Edge are the safe bets;
Safari support is newer and patchier; Firefox varies by version.
- Not every browser build includes H.264 and AAC, which are patented.
Where they are missing, the export falls back to a .webm file using
VP9 and Opus. It plays anywhere modern and converts to MP4 easily.
- Long recordings. Two things still hold a whole file
in this tab's memory: decoding a file's sound (about 23 MB a minute,
uncompressed) and an export (the finished video is built in memory
before it downloads). Files under 30 minutes and 1.5 GB, and exports
under about 1.5 GB, are safest. VIDEDTR warns when you import a file
past that, and when an export's estimated size is; trim a long
recording or work on it in parts.
- Frame-accurate seeking depends on the source file. Variable frame rate
recordings (phones, some screen recorders) can drift slightly.
- Icons are Lucide (lucide.dev), used
under the ISC license and embedded directly rather than fetched.
VIDEDTR -
A video editor that runs entirely in your browser. Nothing you open is
uploaded, and the page is not permitted to open a network connection at
all - the browser enforces that, rather than the code merely promising it.
| Version | - |
| Built | - |
| Offline copy | Checking… |
| Automatic backup | - |
| Running as | - |
| Theme | - |
| Video export | - |
Reloading and updating
Installed as an app, this has no address bar and no pull-to-refresh -
there is no browser chrome for them to sit in - and it deliberately
loads from its offline copy first so it opens with no network. Those two
together mean an installed copy cannot notice a new version on its own.
These buttons are how you make it look.
Credits and licenses
Icons are Lucide
1.47.0, ISC license, embedded as path data rather than loaded from a CDN.
Export uses mp4-muxer and webm-muxer by Vanilagy,
fetched from a pinned CDN URL with a subresource-integrity hash the first
time you export, then kept in the offline copy.
Everything else is hand-written and has no dependencies.
Sound credits
The five Reaction sound effects are SCRNCSTR's, and like SCRNCSTR's
they are CC0 1.0 (a public domain dedication) from
Freesound.
CC0 asks for no credit, but the people who recorded them deserve it:
The seven Cue sounds are made by VIDEDTR's own code.