Subtitle / SRT Formatter
Validate subtitle timing and formatting — auto-fix overlaps and numbering
Paste SRT
Validation cues found
✓ No issues — timestamps, order and formatting all look valid.
Fixed Output
Subtitle / SRT Formatter — Complete Guide & Instructions
MakeCard SRT Formatter checks a subtitle file for the errors that break playback — unparseable timestamp lines, cues whose start comes after their end, overlapping entries, and empty text — then repairs everything automatically. The fixer resequences numbering, normalizes timestamps to HH:MM:SS,mmm format, resolves overlaps, and enforces a minimum 0.5-second cue duration before you download a clean .srt.
How to Use Subtitle / SRT Formatter
- 1 Paste your SRT content into the left box, or click "or upload .srt file" to load a file.
- 2 Press "Validate" to see how many cues were found and every issue detected.
- 3 Click "Fix & Download .srt" — overlaps are resolved, numbering is redone, and timestamps are normalized.
- 4 Review the Fixed Output panel and save the downloaded fixed.srt.
Key Features & Capabilities
- Validation flags unparseable blocks, reversed or invalid timestamps, overlaps, and empty cues.
- Auto-fix resequences cue numbers and normalizes time to HH:MM:SS,mmm.
- Overlapping cues are pushed forward so no cue starts before the previous ends.
- Minimum cue duration of 0.5 seconds enforced automatically.
- Accepts comma or period millisecond separators and .srt or .txt uploads.
- Cue count shown so you can verify nothing was dropped.
Supported Formats & Specifications
| Parameter | Specification |
|---|---|
| Input | Pasted SRT text or uploaded .srt/.txt file |
| Checks | Parse errors, invalid times, start >= end, overlaps, empty text |
| Fixes | Renumbering, timestamp normalization, overlap resolution, 0.5s minimum duration |
| Output | fixed.srt download plus a previewable fixed text panel |
| Processing | Entirely in-browser |
Practical Everyday Use Cases
- Repairing a downloaded subtitle file that shows out-of-order or stuck captions.
- Cleaning machine-generated SRT from an auto-captioning tool.
- Renumbering cues after manually editing a subtitle file.
- Normalizing mixed timestamp formats before importing into a video editor.
- Removing overlap glitches that make captions flicker on screen.
Pro Tips for Best Results
- Run Validate first to see exactly what was wrong before fixing.
- Cues the parser cannot read at all are skipped in the fixed output — check the count to spot drops.
- The fixer never shortens a cue below half a second — verify very fast dialogue still reads well.
- Keep the original file; download writes a new fixed.srt without touching it.
Common Problems & Solutions
Blocks with no parseable timestamp line are skipped — find them in the validation list and correct the time line manually first.
The tool fixes structure, not synchronization — shift all cues in your video editor if the whole file is offset.
Only .srt and .txt are accepted; rename other extensions or paste the content directly.
Privacy & Security
100% Client-Side Execution
Your subtitle text is parsed and repaired entirely in your browser — files are never uploaded or stored.
Frequently Asked Questions
Everything you need to know about using Subtitle / SRT Formatter
Paste it into this tool and press Validate — it flags bad timestamps, overlaps, and empty cues, then Fix & Download produces a repaired .srt with correct numbering.
HH:MM:SS,mmm — hours, minutes, seconds, and comma-separated milliseconds, joined by --> between start and end times. The fixer normalizes all cues to this form.
Overlapping cue times usually come from merges or machine captioning; the tool detects every overlap and pushes each cue to start after the previous one ends.
No — it repairs formatting and ordering issues. A uniform time offset needs a shift tool or the sync controls in your media player.
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