How to Convert PGS to SRT
Upload your PGS subtitle file (.sup), select the subtitle language, and click Convert. The browser uses OCR to read each subtitle image and output a standard SRT text file — no server upload, no software needed.
- Upload your SUP (PGS) file
- Select subtitle language
- Click Convert
- Download your SRT file
PGS: The Presentation Graphic Stream Format
Technical Specification
PGS (Presentation Graphic Stream) is the image-based subtitle format used on Blu-ray discs. Each subtitle is stored as a bitmap picture rather than text, so OCR is required to convert PGS to SRT. SRT is a plain text format that every media player and subtitle editor supports natively.
Each PGS segment includes composition and window objects that define where the subtitle image appears on screen, along with PTS (Presentation Timestamp) values that determine when it shows and hides. This precise timing metadata is preserved intact during conversion to SRT.
PGS Files Are .sup Files
PGS subtitles are also commonly stored as SUP files.
Tools like FFmpeg, MKVToolNix, and HandBrake extract PGS streams as .sup files. This pgs to srt converter accepts .sup files and processes the PGS data they contain.
When Do You Need to Convert PGS to SRT?
- Extract subtitles from Blu-ray or MKV. PGS subtitle streams embedded in MKV files must be extracted and converted to SRT to make them editable and universally compatible.
- Edit subtitle text or timing. PGS subtitles are locked images. Converting to SRT gives you a plain text file you can edit in any text editor.
- Translate subtitles. To convert PGS subtitles to SRT is the first step in any subtitle translation workflow — translators need editable text, not images.
- Use subtitles in VLC, Plex, or Jellyfin. SRT files load natively in these players without transcoding, which PGS requires.
Converting PGS Streams to SRT Text
Why PGS Requires OCR
PGS stores no textual data whatsoever. The subtitle content exists purely as pixel data. Converting PGS to SRT therefore requires OCR — the same technology used to digitize scanned documents. There is no shortcut: every image must be analyzed to extract the text.
This converter uses Tesseract OCR, the most widely adopted open-source OCR engine, trained on diverse typefaces and supporting 40+ languages. Tesseract's LSTM-based models achieve 95–99% accuracy for standard Latin-script Blu-ray subtitle fonts.
PGS Sources: Blu-ray and MKV
PGS subtitle streams exist in two common contexts: embedded in MKV container files (the most common source for ripped Blu-rays) and as standalone .sup files extracted directly from Blu-ray disc structures. Both forms contain identical PGS data and convert identically.
PGS to SRT — Common Searches
Related PGS subtitle conversion queries:
Convert PGS Subtitles to SRT Now
Upload your file and get SRT instantly. No account, no installation, no upload to any server.
Frequently Asked Questions
Is PGS the same as SUP?
Yes. PGS (Presentation Graphic Stream) is the format; .sup is the file extension. A .sup file contains PGS subtitle data. Tools may label it either way — they refer to the same thing.
What is the difference between PGS and HDMV PGS?
HDMV PGS is how FFmpeg identifies the same format. HDMV stands for High Definition Multimedia Vehicle, the Blu-ray authoring framework. The subtitle data is identical to standard PGS.
Can I convert PGS subtitles from an MKV file directly?
Not directly — extract the PGS stream first as a .sup file using FFmpeg (ffmpeg -i file.mkv -map 0:s:0 output.sup) or MKVToolNix, then upload the .sup file here.
Does the converter handle PGS subtitles with multiple subtitle tracks?
A .sup file typically contains one subtitle track. If your MKV has multiple subtitle streams, extract each one separately and convert them individually.
How accurate is PGS to SRT conversion for non-English languages?
Accuracy varies: 95–99% for Western European languages, 85–95% for Arabic/Hebrew/Cyrillic scripts, and 75–90% for CJK (Chinese, Japanese, Korean). Select the correct language for best results.