What is an SRT file and how do I fix subtitle timing that is out of sync?

An SRT (SubRip Text) file is a plain-text subtitle format containing numbered entries with start/end timestamps and the subtitle text. If all subtitles are consistently early or late (e.g. always 2.3 seconds behind), use this tool to apply a fixed offset to every timestamp at once.

What is frame rate drift in subtitles and how do I fix it?

Frame rate drift occurs when subtitles were authored for a 25fps version of a video but you have a 23.976fps version (or vice versa). The offset starts small but grows throughout the video. Fix it using the linear scale multiplier: enter the source and target frame rates and the tool applies a proportional correction to every timestamp.

How do I find the correct subtitle offset to apply?

Identify a moment where you can match a subtitle to a clear visual cue (e.g. lips moving, a door slam, a name spoken). Note the video timestamp of that event and the subtitle's current timestamp. The difference is your offset - enter it as positive (subtitles are early) or negative (subtitles are late).

SRT Subtitle Timing Adjuster

Your subtitle file is out of sync with the video. Upload it, set an offset in milliseconds or seconds, and download the corrected file. Drift correction handles frame rate mismatches too. Nothing uploaded.

SRT format ? Time offset Drift correction ? Before/after preview Batch mode

Mode: Single file

Drop your .srt file here

or click to browse · .srt files only

- subtitles

- total duration

- avg length

- max gap

Time offset

Shift amount (milliseconds)

-60 s 0 +60 s

When timestamps go negative Clamp to 00:00:00,000 Remove subtitles that go negative

Output encoding

Output filename pattern

Use {original} for original filename, {offset} for offset value.

Frame-rate drift correction

Multiplier (1.0 = no correction)

FPS presets

Apply a preset when subtitles drift progressively further out of sync throughout the video - a sign of a frame-rate mismatch rather than a fixed offset.

#	Original timecode	Adjusted timecode	Text

Processing is entirely in your browser - nothing is uploaded to any server

SRT timing offsets and frame-rate drift

How to identify the right subtitle offset

Subtitle sync problems fall into two categories. Constant offset means all subtitles are consistently early or late - perhaps the whole file is 2.3 seconds behind. Find a moment with a clear audio cue (someone says a name, a door slams, a bell rings) and check how far off the subtitle is. That difference is your offset. Positive offset delays subtitles further into the future, negative advances them. For example, if a subtitle appears at 00:01:00,000 but the audio happens at 00:01:02,300, your offset is +2300 milliseconds.

What is frame-rate drift and how to fix it

Drift happens when subtitles were timed for one frame rate (e.g. 25 fps) but your video is a different frame rate (e.g. 23.976 fps). The first subtitle might be perfect, but by the end of the file, you're several seconds off. The fix is a multiplier, not a fixed offset. A 23.976-to-25 conversion multiplies all timecodes by 1.04260 - this scales the entire file so it matches the video pacing. Use an FPS preset if your conversion is common, or enter a custom multiplier to fine-tune.

FAQ

Should I clamp negative timestamps to zero or remove the subtitles?

If you apply a large negative offset, some subtitles might end up before the video starts (negative times). Clamping shifts them to 00:00:00,000 so they appear at the start instead. Removing them deletes those subtitles entirely. Clamping is usually safer - you keep the content even if the timing isn't perfect. Removing is useful if only a few opening credits need to be eliminated.

What's the difference between UTF-8 and UTF-8 with BOM?

UTF-8 with BOM adds a 3-byte marker at the start that tells Windows "this is UTF-8." Most modern software ignores it, but older Windows subtitle software sometimes requires it. If you're unsure, UTF-8 without BOM is the safe choice - it's the standard. Only use BOM if your media player complains.

Can I batch process multiple SRT files at once?

Yes. Toggle on Batch mode, then select multiple .srt files at once. The tool applies the same offset and drift correction to all of them and lets you download them as a ZIP file. You can customize the output filename pattern so each file gets a unique name with the offset value appended.

Last reviewed: May 31, 2026

How to fix SRT subtitle timing

Upload your .srt file and enter the offset in milliseconds. Use a positive number to delay subtitles (they appear later) and a negative number to advance them (they appear earlier). The slider covers -60 s to +60 s, or type any value directly.

For progressive drift - where the first subtitle is correct but the last is several seconds off - use a drift multiplier or pick an FPS preset. This applies a linear scale to all timestamps, correcting frame-rate mismatches between the subtitle file and the video.