Change video speed
Shorten a lecture at 2× or slow a tutorial to 0.5×. Audio follows with “Keep pitch” so voices stay natural.
Settings
How to use
- 1
Add videos
Drop the videos whose speed you want to change.
- 2
Choose the speed
From 0.25× to 4×. With “Keep pitch” on, voices keep their natural pitch. Remove the audio if you do not need it.
- 3
Run and save
The video is re-encoded, so processing time scales with its length.
What happens when speed changes
Video frames are retimed and re-encoded; any frames beyond 60 fps are dropped, so even 4× stays smooth. Audio is time-stretched with WSOLA, preserving the pitch.
Because the video is re-encoded, processing time scales with its length. For long lectures, “Extract audio from video” followed by “Change audio speed” is often faster.
Frequently asked questions
What happens to the audio?
With “Keep pitch” on, voices speed up at their natural pitch. Turn it off to change the pitch too, or remove the audio for a silent video.
Is quality lost?
The video is re-encoded, so it changes slightly according to the Quality setting. At “High” or above the difference is negligible.
How long does it take?
With a hardware encoder, a fraction of the video’s length.
Why does slow motion look choppy?
Frames are held longer rather than interpolated, so at 0.25× each frame repeats four times. Frame interpolation is not supported.
Help us improve the service
If a conversion fails, sending us the circumstances helps us track down the cause. Knowing which devices and formats fail most often, and how long processing takes, lets us revise the supported formats and fix the bugs behind them. If you don't mind, leaving this on is a real help.
What is sent
- The tool you used and the settings you chose (output format, quality, etc.)
- Your device specs (GPU, memory, core count)
- The input format with a rough size
- How many files succeeded or failed and how long it took
- The error type and details when something fails
What is never sent
- The files themselves and file names
- Text, subtitles or prompts you add to a video
- The text to be read aloud, voice descriptions, the pronunciation dictionary and saved voices
- The text in PDFs, the text you rewrote or redacted, passwords, font names and the page ranges you enter
- IP addresses
The data goes only to this site's own server, never to a third-party service.
Details sent by specific tools (counts, times, kinds and yes/no only)
In addition to “What is sent”, text to speech and the PDF tools send the following details.
- Text to speech
- The approximate number of characters and sentences, how many parts the text was generated in, and how long the AI model took to load.
- PDF tools (all)
- The page count range, whether editing is restricted, whether a permissions password was entered, and whether the PDF is signed or encrypted.
- PDF text editing and redaction
- The numbers of rewrites, deletions, white-outs and redactions, the number of rewritten characters by source (original font or fallback font, the latter as a range) and the fallback typeface, the kinds of reasons why lines cannot be edited, and the number of pages turned into images by redaction and the reasons.
- PDF page operations and conversion between images and PDF
- The numbers of inputs and outputs, of pages rotated, deleted, duplicated or moved, of images inserted as they are, converted, in HEIC format or with corrected orientation, and of pages rendered at a lower resolution (all as ranges), whether the original was updated in place or a new document was created, and whether the original protection was reapplied, form fields were written into the page and bookmarks were added back.
- PDF compression
- The numbers of inputs and outputs, of images downsized, not downsized and black-and-white, of downsized images whose transparency was also downsized, that stayed lossless or that were converted from CMYK to RGB, and how many times the file was compressed (all as ranges), the kinds of reasons images were not downsized, whether the target size was met and the kind of reason it was not met, the range of how much smaller the file got, whether the original protection was reapplied, and whether the original PDF was returned unchanged.
- PDF cropping and page numbers
- The numbers of inputs and outputs and of pages cropped, numbered or with their margins reduced (all as ranges), how the margins were set, how the pages to crop or number were chosen, the number format and position, the range of the starting number, that the original was updated in place, and whether the original protection was reapplied.