6 Free Subtitle Sync Software to Adjust SRT Time [2025 List]
Finding the right subtitles for a video can be tricky, but subtitle sync software helps adjust timing issues caused by different releases, frame rates, or encoding methods.
If no matching subtitles are available, you can either wait for someone to upload them or manually sync an out-of-sync file using the right tools.
- Wondershare UniConverter – Best Subtitle Sync Software to Adjust SRT Time overall
- PotPlayer – Advanced media player with premium features
- Sublight – Best for downloading subtitles in multiple languages
- Easy Subtitles Synchronizer – Best for synchronizing, correcting, and fixing subtitles
- Subtitle Workshop – Great for creating, editing, and converting subtitle files
- Subtitle Edit – Open source editor for subtitles
- SRT Time Shift – Best for shifting the timecodes of your subtitles
- Resync Subtitles – Online tool for permanently shifting subtitle files
- SubMagic – Great tool for synchronizing subtitles in a movie
- Jubler Subtitle Editor – Best tool for synchronizing the time of a subtitle
1. Wondershare UniConverter – Best Subtitle Sync Software to Adjust SRT Time overall
- Operating System: Windows and Mac
- Pricing: Freemium
- Developer: Wondershare
Wondershare UniConverter does more than just sync subtitles—it lets you convert, compress, edit videos, and even extract subtitles from a file.
You can manually adjust subtitle delays, tweak their timecodes, and export the video with properly synced SRT or ASS files.
Pros
- Download videos online from YouTube and other sites
- Edit, convert, burn, compress, and perform other tasks on videos
- Edit multiple audio and subtitle tracks on a video
- Extract subtitles files from a video as SRT, SSA, and ASS files
Cons
- The free version has limited features
Download Wondershare UniConverter
2. PotPlayer – Advanced media player with premium features
- Operating System: Windows
- Pricing: Free
- Developer: Daum Communications
PotPlayer is an advanced media player that lets you manually sync subtitles with your video. Simply place the video and subtitle file in the same folder with matching names, and it will auto-load the subtitles.
For manual sync: Pause > Scene > Subtitles > Sync Subtitles to fix any delays.
Pros
- PotPlayer supports various kinds of 3D glasses
- Sync and edit different types of subtitle files
- Supports open codecs so viewers can add different codecs they require
- Bookmark your favorite scene or chapter in a video
Cons
- The software may include bundled software and advertisements during installation
3. Sublight – Best for downloading subtitles in multiple languages
- Operating System: Windows
- Pricing: Free
- Developer: Sublight Labs / Sublight
Sublight scans your video file and finds the best subtitle match based on frame rate (FPS) and encoding.
It offers millions of subtitles in 46 languages and integrates directly into Windows File Explorer for quick access.
Pros
- Access millions of subtitle files in different languages
- Search for subtitles from your Windows File Explorer
- Synchronize subtitles to download the most suitable
- Scan your video to find the most suitable subtitles
Cons
- Not many non-English subtitles as advertised
4. Easy Subtitles Synchronizer – Best for synchronizing, correcting, and fixing subtitles
- Operating System: Windows
- Pricing: Free
- Developer: Madalina Boboc
This tool lets you manually adjust SRT and SUB files to sync with your video.
Load a subtitle file, preview it in real-time, and correct timing offsets, encoding errors, or framerate mismatches.
Pros
- Great tool for editing subtitles
- Download subtitles from the internet
- Synchronize, fix, and correct subtitles
- Create your subtitles from scratch
Cons
- The software is a little tricky
Download Easy Subtitles Synchronizer
Read more:
- Subtitle Finder & Downloader: 5 Best Subtitle Search Engines
- 3 Ways to Add Two or More Subtitles to Video
- 6 Best Players to Play Two Subtitles At The Same Time
5. Subtitle Workshop – Great for creating, editing, and converting subtitle files
- Operating System: Windows
- Pricing: Free
- Developer: Andrey Spiridonov
A powerful open-source subtitle editor that supports 60+ subtitle file formats.
It lets you shift subtitles forward or backward in time, adjust frame rates (FPS), encoding, and timecodes, and even translate text.
Pros
- The software can convert, create, edit, open, and save over 60 subtitle formats
- It comes with a vast array of customization tools
- Time and manipulate text with smart line adjusting, spell check, and FPS conversion
- Display and manipulate timing pauses and enhance multi-level redo and undo
Cons
- The program may have a timing problem, and it’s not designed for beginners
6. Subtitle Edit – Open source editor for subtitles
- Operating System: Windows
- Pricing: Free
- Developer: Nikse
Subtitle Edit allows you to sync, adjust, and translate subtitles.
It features audio visualization, speech recognition (Whisper & Vosk) for automatic subtitle syncing, and DVD subtitle ripping.
Pros
- Adjust, sync, or translate subtitles
- Speech recognition audio-to-text tools
- Visually adjust a subtitle track
- Cool audio visualizer control in waveform or spectrogram
Cons
- It’s only ideal for small projects
7. SRT Time Shift – Best for shifting the timecodes of your subtitles
- Operating System: Web Bases
- Pricing: Free
- Developer: Happy Scribe Ltd
SRT Time Shift is a simple online subtitle sync tool that lets you adjust subtitle offsets by entering a + or – value in seconds or milliseconds.
Great for quickly fixing SRT subtitle delays without downloading software.
Pros
- Upload an SRT file to the website for syncing
- Provide offset in seconds or milliseconds
- Download SRT files in the right encoding and format
- You don’t need to install any software on your PC
Cons
- The application is only limited to syncing SRT files
8. Subtitle Tools – Online tool for permanently shifting subtitle files
- Operating System: Web Based
- Pricing: Freemium
- Developer: Subtitle Tools
Subtitle Tools lets you shift subtitle timing permanently by entering the delay in milliseconds.
It works with SRT, SSA, ASS, SMI, and WebVTT formats.
Pros
- You only need to upload your file and enter the duration span
- Shift multiple or specific parts of a subtitle file
- Produce a permanently shifted subtitle
- Shift subtitles with uniform delay and those that are out of sync
Cons
- You cannot visually edit the subtitle
9. SubMagic – Great tool for synchronizing subtitles in a movie
- Operating System: Windows
- Pricing: Premium
- Developer: Submagic
SubMagic is an advanced tool for analyzing, editing, and synchronizing subtitles.
It lets you adjust FPS, modify timecodes, and even add emojis to subtitles.
Pros
- Generate subtitles with Emojis
- Edit videos easier with AI
- Descriptions and hashtags are generated by AI
Cons
- It requires you to share the app to get one video edit
10. Jubler Subtitle Editor – Best tool for synchronizing the time of a subtitle
- Operating System: Windows
- Pricing: Free
- Developer: Jubler
Jubler is a Java-based subtitle editor that requires MPlayer for video preview.
It lets you adjust index offsets, shift subtitle timecodes, and correct FPS mismatches.
Pros
- Synchronize the time of a subtitle
- Enter the time difference between the video and the subtitle
- Small freeware of about 77kb
- Great for removing commercial breaks in videos
Cons
- Features a non-impressive interface
Download Jubler Subtitle Editor
When looking for subtitles for a movie, you might never think to edit available SRTs to match your video framerate; it might seem so tiring.
However, with these tools, you can sync subtitles easily with your movie. You can also create subtitles for your personal videos to upload on streaming sites.
What do you think about the above-mentioned tools? Which tool did you find most exciting? Share your thoughts in the comment section below.
Several “free” tools would not work unless you donate something. Shame on their authors. The simplest tool SubtitlesSynch works best!
Another one, which is online so it doesn’t require installation… The functionality is very limited, but it does the job if you need to adjust all the subtitles with the same time diff.
petermoor.nl/overig/srt-editor.html
This online tool is the best! Thanks for the idea!
I tried aegis and it wasnt comfortable! easy sync it was better if the video interface it could be improved!
Excellent (incomplete) list. Maybe try Aegisub found at aegisub.org.
“Aegisub is a free, cross-platform open source tool for creating and modifying subtitles. Aegisub makes it quick and easy to time subtitles to audio, and features many powerful tools for styling them, including a built-in real-time video preview.”
no Aegisub doesn’t have the most basic weapon of all. adjust all subtitles with dirst spoken and last spoken like other programs. It is unacceptable that the program maker did not notice this
out of the hundreds of rips I’ve encountered over the years only one time the subs were so out of sync that the first and last spoken word retiming would help. 99.9% of the time the timing is correct it’s just out of sync due to particular subs not matching a particular rip. Aegisub would be fine for most cases.
anyways, Aegist is a piece of crap as it doesn’t support binary sub
Sadly it hasnt been updated for a long time and it now has a glitch where needed controls just show as dots and you can’t adjust the granularity of the audio field anymore. It was fantastic till recently. Maybe if you have an older computer and OS. Certainly this is the case for Macs. Not sure about PCs
SubtitlesSynch works perfectly. Simple to use. Small size. Excellent app!
Thank you, you’re the best <3
I use this simple webapp to recalculate the timestamps of a SRT file:
guaser.info/php_srrSyncSubtitles/
Some of the alternatives exposed in this article are also interesting for more complex tasks related to subtitles. Thanks for this article!
Not free. Free is the point of the article.
This article misses BatchSubtitlesConverter from sites.google.com/site/tsdarkness/batchsubtitlesconverter. It allows mass FPS adjustment. It works unlike Subtitle framerate changer which produces junk for some files.
Very well explained and useful reply. Thank you!
You can use our site subsync.net to sync a bad-synced subtitle in your language based on a good-synced subtitle in ANY language.
All you need to do is to find one good-synced subtitle in any language and to go to subsync.net .
The service is given absolutely for free. You can also visit subsync.net/about for more information.
Enjoy!
SubSync.
OMFG where have you been my entire life?
this site is awesome
Wonderfull solution SubSync! Thank you!
Crazy good stuff on subsync.net . Done it in a minute. THX
subsync.net rulez, can’t believe how simple and fast it was. Definitely the best sollution I’ve seen, no installation needed, perfect!
your site was so goods.
But your sites can not sync now. Why?
If you was good result as before times, I want to use with fees.
subsync.net is now for sale and links are paid-for ads. The original subs sync function is no longer available.
RIP subsync.net
Free (Creative Commons) Excel utility to handle SRT file here: sayitvisually.com/caption-utility/
thank you very much, works like a charm!
THANKS…. FINALLY I CAME TO THE RIGHT PLACE…thank you very much
Thanks, it helped me.
Great….finally I can use any subtitles i wish…Thanks.
thanks for the VLC tip :)
Cool !!!!!
I use km player its much better at synchronizing then vlc
VLC, for watching is okay, but not for permanent sub.
This is interesting we are right in the middle of a video project..
I think this is certainly worth a try especially for the subtitling aspect of it…
Great resource!
I use VLC, and the easiest way is to use ctrl+j and ctrl+h to set the subtitles delay in real time. Also, you can use ctrl+k and ctrl+l if the audio is out of sync. Very easy.