Repair, convert, and batch-process subtitle encodings with a modern, high-performance desktop application.
Bloom Sub is a sleek, reliable desktop utility designed to permanently fix unreadable or corrupted Persian, Arabic, and international subtitle files.
Subtitles often display strange characters such as:
ΓΒ§ΓβΓΒΉΓΒ±ΓΒ¨ΓΕ ΓΒ©
ΓΓΓΓΓ€
ΓΒ³ΓβΓΒ§Γβ¦
These issues are caused by encoding mismatches between legacy subtitle files and modern media players.
Bloom Sub combines a hybrid automatic encoding detection engine with asynchronous multi-threaded processing to quickly convert individual subtitle files or entire media libraries into clean, universal encodings such as UTF-8.
Unlike many online converters, Bloom Sub works completely offline, never uploads your files, and never overwrites your original subtitles, ensuring maximum privacy and safety.
| Feature | Technical Implementation | Benefits |
|---|---|---|
| π Intelligent Auto Detection | Dual-Layer Detection (Heuristic + Chardet Fallback) | Detects legacy subtitle encodings with high accuracy. |
| β‘ Multi-Threaded Processing | QThread Background Worker | Smooth UI with no freezing during large conversions. |
| π Batch & Recursive Conversion | Recursive scanning using os.walk() |
Convert thousands of subtitle files in one operation. |
| π‘ Safe Conversion | Automatic timestamped output folders | Original subtitle files always remain untouched. |
| π Smart Folder Structure | Preserves original directory hierarchy | Converted subtitles stay organized exactly like the source. |
| β¨ Path Cleansing | Removes hidden Unicode direction characters (\u202A, \u202B, etc.) |
Fixes drag-and-drop path issues on Windows. |
| β»οΈ Encoding Fallback System | Multiple decoding attempts on failure | Successfully opens problematic subtitle files without corruption. |
| π Automatic File Naming | Prevents duplicate filenames (_1, _2, ...) |
Eliminates accidental overwrites automatically. |
Bloom Sub follows a secure processing pipeline to maximize compatibility while preventing data loss.
Input Subtitle(s)
β
βΌ
Path Cleansing (RTL/LTR Fix)
β
βΌ
π Hybrid Encoding Detection
βββ Fast Heuristic Matching
βββ Chardet Statistical Analysis
β
βΌ
Background QThread Processing
β
ββββββββββ΄βββββββββ
βΌ βΌ
Read Subtitle Create Timestamped
Content Output Directory
β β
ββββββββββ¬βββββββββ
βΌ
Encoding Conversion Engine
β
βΌ
Smart File Name Generator
(Avoid Duplicate Files)
β
βΌ
β
Verified Converted Subtitle
| Display Name | Python Codec | Description |
|---|---|---|
| Automatic Detection | Hybrid Detection Engine | Automatically detects subtitle encoding |
| UTF-8 with BOM | utf-8-sig |
Windows-compatible UTF-8 |
| UTF-8 | utf-8 |
Universal modern encoding |
| UTF-16 LE | utf-16-le |
Windows Unicode format |
| UTF-16 BE | utf-16-be |
Big Endian Unicode |
| Windows-1256 | windows-1256 |
Persian & Arabic legacy subtitles |
- UTF-8
- UTF-8 with BOM
- UTF-16 LE
- UTF-16 BE
- Windows-1256
Bloom Sub supports:
- SRT
- ASS
- SSA
- SUB
- TXT
- VTT
Bloom Sub features a modern desktop experience built with PyQt5.
- Clean and minimal layout
- Responsive desktop UI
- Compact design
- Live progress bar
- Real-time conversion status
- Smart ComboBoxes
- Automatic output folder generation
- Drag-and-drop support
- Localized RTL dialogs for Persian users
- Python 3.8 or newer
git clone https://github.com/Data-Blooom/Bloom-Sub.git
cd Bloom-Subpip install -r requirements.txtpython main.pyπ‘ No Python installed? No problem!
Bloom Sub is also available as a standalone Windows (.exe) application.
Simply download the latest release and run it instantlyβno installation or configuration required.
- β‘ Fully asynchronous processing
- π§ Intelligent dual-layer encoding detection
- π 100% offline operation
- π Original files remain untouched
- π Automatic timestamped output folders
- π Fast batch conversion
- π‘ Reliable subtitle preservation
- π¬ Designed for large subtitle collections
| Bloom Sub Main Interface |
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Bloom Sub was created by Data Bloom to make subtitle encoding conversion simple, safe, and reliable.
No more unreadable subtitles or broken charactersβjust drag, convert, and enjoy your movies.
