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All FlowSub tools in one place. Convert subtitles, video, and audio. Transcribe, translate, compress, extract, burn-in, and more — free, no ads.
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Subtitle: SRT, VTT, ASS, TXT, CSV · Video: MP4, MKV, WebM, MOV · Audio: MP3, WAV, AAC, FLAC · Free, no sign-up
Every free tool, one place
Subtitle Converters
SRT → VTT
Convert subtitle files
SRT → ASS
Convert subtitle files
SRT → TXT
Convert subtitle files
SRT → CSV
Convert subtitle files
VTT → SRT
Convert subtitle files
VTT → ASS
Convert subtitle files
VTT → TXT
Convert subtitle files
VTT → CSV
Convert subtitle files
ASS → SRT
Convert subtitle files
ASS → VTT
Convert subtitle files
ASS → TXT
Convert subtitle files
ASS → CSV
Convert subtitle files
TXT → SRT
Convert subtitle files
TXT → VTT
Convert subtitle files
TXT → ASS
Convert subtitle files
TXT → CSV
Convert subtitle files
Video & Audio Converters
MP4 → MKV
Convert file
MP4 → WebM
Convert file
MP4 → MOV
Convert file
MP4 → AVI
Convert file
MKV → MP4
Convert file
MKV → WebM
Convert file
MKV → MOV
Convert file
MKV → AVI
Convert file
WebM → MP4
Convert file
WebM → MKV
Convert file
WebM → MOV
Convert file
WebM → AVI
Convert file
MOV → MP4
Convert file
MOV → MKV
Convert file
MOV → WebM
Convert file
MOV → AVI
Convert file
Advanced Tools
Burn Subtitles into MP4
Hardcode SRT, VTT, or ASS subtitles directly into your MP4 video. No re-encoding step needed. Powered by FFmpeg — same engine used by Netflix.
Try free →Merge SRT with MP4
Combine SRT subtitle files with MP4 video. Download a single file with embedded subtitles — no quality loss, no watermark.
Try free →Translate SRT File
Translate SRT subtitle files into 29+ languages using AI. Preserves timestamps, formatting, and line breaks. No sign-up needed for first file.
Try free →Compress Video for Discord
Compress any video to fit Discord's 10 MB file limit. No quality guessing — we target exact file size with smart bitrate adjustment.
Try free →Transcribe Podcast to Text
Convert podcast episodes to text with AI. $8.99/mo for unlimited transcription vs HappyScribe's $10/hour. 29+ languages, accurate timestamps, no ads.
Try free →Transcribe Interview to Text
Convert interview recordings to searchable text. Find key quotes without scrubbing through hours of audio. Used by journalists, researchers, and recruiters.
Try free →Add Subtitles to Video
Add subtitles to any video — free and with zero watermarks. Unlike Veed and Kapwing, we never brand your content. Upload video + SRT, download captioned video.
Try free →MP3 to Text
Convert MP3 audio files to text with AI. Upload any MP3 — music, speech, podcast — and get accurate text output in SRT, VTT, or TXT format. No ads, no sign-up for first file.
Try free →Change Video Resolution
Resize video resolution online — 4K to 1080p, 1080p to 720p, or any custom dimensions. Free, no watermark, no sign-up.
Try free →Extract Subtitles from MP4
Extract subtitle tracks from MP4 video — or generate SRT from audio if none exist. Download as SRT, VTT, TXT. Free, no ads, no watermark.
Try free →WAV to MP3 Converter
Convert WAV audio files to MP3 online. High-quality LAME encoder, adjustable bitrate. No sign-up, no ads, no file size limits.
Try free →Video to Audio Converter
Extract audio from any video file. Convert MP4, MKV, MOV to MP3, WAV, AAC, or FLAC. Free, no sign-up, no quality loss.
Try free →Audio Noise Remover
Remove background noise from audio and video files. FFT-based denoising eliminates fan hum, AC noise, street sounds, and static. Free, no sign-up.
Try free →Compress Video
Compress video files online without losing noticeable quality. Reduce MP4, MKV, MOV by up to 85%. Free, no watermark, no sign-up.
Try free →Generate SRT from Video
Auto-generate SRT subtitles from any video using AI. Upload MP4, MKV, MOV, or WebM and get perfectly timed SRT subtitles in under 3 minutes. Free, no ads.
Try free →FFmpeg Tool Suite
Noise Remover
Remove background noise from audio/video using FFT denoising. Great for cleaning up fan hum, AC noise, street sounds.
Video Trimmer
Cut and trim video to exact start/end timestamps. Fast seeking with frame-accurate cuts.
Audio Extractor
Extract audio track from video files. Choose from MP3, WAV, AAC, Opus, or FLAC output.
Video Compressor
Reduce video file size while preserving quality. Choose compression level.
Speed Changer
Speed up or slow down video and audio in sync. Range: 0.25x to 4.0x.
Audio Normalizer
Normalize audio loudness to broadcast standard (EBU R128). Smooths volume across entire file.
Silence Remover
Automatically detect and remove silence from audio. Trims dead air at start, end, and middle.
Format Converter
Convert between video and audio formats. MP4, MKV, WebM, MP3, WAV, AAC, FLAC, and more.
AI Voice & Magic Tools
AI Dubbing
Replace video audio with AI-generated voiceovers in 29+ languages. Preserve emotion, timing, and tone. Free, no watermark. Upload up to 500 MB.
Text to Speech
Convert text to lifelike speech with AI. 29+ languages, 50+ voices. Male, female, and neutral tones. Download as MP3 or WAV. 500 MB limit. No watermark.
AI ASMR Voice Generator
Generate ASMR-style whispers and soft-spoken AI voices. Perfect for relaxation content, sleep aids, and meditation. Free, no watermark. 500 MB limit.
Audio Translate
Translate audio files into 29+ languages. Upload MP3, WAV, or any audio — get translated text or dubbed audio back. 500 MB. No watermark.
Add Audio to Video
Add background music, voiceovers, or sound effects to any video. Replace the original audio track or mix both. MP4 output. 500 MB. Free, no watermark.
AI Sound Effect Generator
Generate sound effects from text descriptions. Type 'rain on a tin roof' or 'sci-fi door opening' — AI creates the sound. 500+ categories. Free, royalty-free.
AI Tone Rewriter
Rewrite any text with a different tone — formal, casual, persuasive, humorous, professional, empathetic. Perfect for scripts, emails, and content. Free, no sign-up.
AI Audiobook
Turn any book, script, or document into a narrated audiobook with AI voices. 50+ voices, chapter markers, natural pacing. 500 MB. Free, no watermark.
Podcast Generator
Generate complete podcast episodes from a script, outline, or topic. AI narration with intro/outro music, natural pacing. 50+ voices. Free, no watermark.
Video Volume Booster
Boost video volume without distortion. Increase audio gain up to 300% with peak limiting. Perfect for quiet recordings. 500 MB. Free, no watermark.
Accent Generator
Apply or change accents with AI. Convert your voice to British, American, Australian, Indian, and 20+ more accents. TTS mode or voice conversion. Free, no watermark.
Video to Text Converter
Convert any video to text with AI. MP4, MKV, MOV, WebM to TXT, SRT, VTT. 29+ languages. 500 MB. Free, no sign-up for first file. No watermark.
SRT Translator
Translate SRT subtitle files into 29+ languages. AI preserves timestamps, line breaks, and formatting. Upload SRT or VTT. 500 MB. Free, no watermark.
MP3 to SRT
Convert MP3 audio to SRT subtitles with AI. Whisper transcribes speech to timed subtitles. 29+ languages. 500 MB. Free, no sign-up for first file.
MP4 to SRT Converter
Convert MP4 video to SRT subtitles with AI. Upload any MP4 — get perfectly timed SRT subtitles. 29+ languages. 500 MB. Free, no watermark, no sign-up.
Video to SRT Converter
Convert any video to SRT subtitles automatically. MP4, MKV, MOV, WebM — all supported. AI transcription with word-level timestamps. 500 MB. Free, no watermark.
Subtitle Translator
Translate subtitle files (SRT, VTT, ASS) into 29+ languages. AI preserves formatting, timestamps, and context. 500 MB. Free, no sign-up for first file.
Voice Over
Create professional AI voiceovers for videos, ads, and presentations. 50+ voices, 29+ languages. Adjustable tone, pace, and style. 500 MB. Free, no watermark.
Movie Dubbing
Dub movies into any language with AI. Preserve emotion, timing, and voice character. 29+ languages. 500 MB. Free, no watermark. Professional-grade output.
Film Dubbing
Localize films into any language with AI dubbing. Preserve artistic intent, emotion, and timing. 29+ languages. 500 MB. Free, no watermark.
Subtitle to Speech
Convert SRT subtitle files into spoken AI voiceover. Perfect timestamps → perfectly timed speech. 50+ voices, 29+ languages. 500 MB. Free, no watermark.
AI Video Localization
Localize videos end-to-end with AI. Translate audio, generate subtitles, and dub voice — all in one workflow. 29+ languages. 500 MB. Free, no watermark.
Anime Dub
Create AI anime dubs in any language. Upload anime episodes, assign character voices, and get a fully dubbed version. 29+ languages. 500 MB. Free, no watermark.
Frequently asked questions
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Do you add watermarks?
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What's the difference between Free and Starter?
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Ready to go Pro?
Free tier gets you started. Starter plan unlocks everything.
- 250 credits/month
- Unlimited transcription
- Subtitle translation
- Burn-in rendering
- All FFmpeg tools
- Priority support
All tools — free, fast, no ads.
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