Docs · Studio Tools

Studio Tools Documentation

Fifteen production-ready audio and video utilities. Every tool exposes a signed REST endpoint, a frontend UI at /app/tools, and bundled sample media so you can preview before-and-after in under 15 seconds.

Interactive API reference →

Scalar-powered, with live Try-It using your API key.

OpenAPI 3.1 spec →

JSON — drop into Postman, Insomnia, or your codegen pipeline.

Error catalog →

Every error code, what it means, and how to recover.

Audio Suite

Silence Trimmer

POST /tools/trim

Remove dead air and quiet breath gaps from audio

Signature5 removal modes — including 'edges only' which preserves rhythm

When to use

→Remove dead air from podcast recordings
→Strip only the leading + trailing pauses (keep interior breathing)
→Tighten voice memos before uploading

Try it in the app →API reference →

Loudness Normalizer

POST /tools/normalize

Hit Spotify / YouTube / Podcast loudness specs

Signature7 platform presets + 2-pass EBU R128 (transparent, no dynamics crushing)

When to use

→Hit Spotify / YouTube / Apple Podcasts LUFS specs in one click
→Level a podcast episode or clip to the same perceived loudness standard
→Fix a quiet or hot-mastered recording to broadcast standards

Try it in the app →API reference →

Music Ducker

POST /tools/duck

Duck background music under speech

When to use

→Duck background music under narration after you run the tool
→Use Podcast, Narration, or DJ Style presets to quickly configure the ducking settings
→Blend music + dialogue without drawing manual volume automation

Try it in the app →API reference →

Batch Converter

POST /tools/convert

Convert between audio formats

Signature11 formats including Opus, ALAC, CAF, W64 — with VBR for smaller+better

When to use

→Convert WAV to MP3 for distribution
→Re-encode to Opus for smaller web files
→Transcode to ALAC / FLAC for archival

Try it in the app →API reference →

Audio Merger

POST /tools/merge

Seamlessly join multiple tracks

SignaturePer-gap crossfades + auto-level each clip before merging

When to use

→Stitch podcast takes with smooth crossfades
→Concatenate multi-part audiobook chapters
→Combine voice + outro music with automatic level matching

Try it in the app →API reference →

Audio Splitter

POST /tools/split

Segment audio by time, count, or silence

SignatureSplit-by-silence + CUE sheet export

When to use

→Segment a long lecture into chapter-sized files
→Auto-split a multi-take recording on silence
→Cut at user-defined timestamps for editing

Try it in the app →API reference →

Audio Fade

POST /tools/fade

Professional fade-in and fade-out

SignatureMulti-point fade automation (up to 64 points)

When to use

→Smooth fade-in/out at clip edges
→Add mid-clip volume dips with multi-point automation
→Prevent abrupt starts/ends on exports

Try it in the app →API reference →

Volume Changer

POST /tools/volume

Boost or lower loudness by a set % or dB

Try it in the app →API reference →

Stem Splitter

POST /tools/stem-split

Separate vocals, drums, bass, other from a mix

SignatureHigh-quality source separation for vocals, drums, bass, and other stems

When to use

→Extract vocals for karaoke or remixes
→Isolate drums for drum replacement
→Clean a vocal track before voice cloning

Try it in the app →API reference →

Video Suite

Audiogram Generator

POST /tools/audiogram

Waveform visuals for social media

SignatureText caption burn-in + animated progress bar + VP9/WebM output

When to use

→Turn a podcast clip into a shareable social video
→Add waveform visuals for TikTok / Reels / X
→Promote an episode with an animated progress bar + caption

Try it in the app →API reference →

Video Resizer

POST /tools/resize

Crop for TikTok, Reels, and Shorts

SignatureSmart Crop — face detection keeps the subject in frame

When to use

→Convert landscape footage to TikTok / Reels 9:16
→Create square Instagram Feed videos
→Keep faces centered when changing aspect ratio

Try it in the app →API reference →

Brand Overlay

POST /tools/watermark

Add your logo to any video

SignatureText or image, 9-point positioning, animated fade, timed visibility window

When to use

→Add your logo to clips before publishing
→Brand social videos with text watermark + timing
→Fade the watermark in/out during specific sections

Try it in the app →API reference →

Thumbnail Extractor

POST /tools/thumbnail

Pick the perfect frame from any video

Signature4 modes: single, smart-pick, scene-change, contact-sheet grid

When to use

→Grab a cover frame for YouTube
→Auto-pick the best representative frame
→Generate a contact-sheet preview grid

Try it in the app →API reference →

Advanced Utilities

Audio Extractor

POST /tools/extract

Pull audio out of video files

SignatureMulti-track selection + proper L+R average mono downmix

When to use

→Pull audio from a video for transcription
→Extract a specific language track from a multi-audio video
→Downmix stereo video audio to clean mono

Try it in the app →API reference →

Metadata Injector

POST /tools/metadata

Update ID3 and media tags

SignatureCover art embed + podcast-style chapter markers (FFMETADATA1)

When to use

→Tag podcast episodes with title, artist, episode number
→Embed cover art for music players
→Add chapter markers for Apple Podcasts / Overcast

Try it in the app →API reference →

Pitch/Speed Shifter

POST /tools/shift

Transform voice tone and tempo

SignatureFormant-aware mode — pitch-shift voices without artifacts

When to use

→Transcribe fast-talker content by slowing down without pitch distortion
→Pitch-correct a recording up or down by semitones
→Create vocal effects (chipmunk, demon voice) — or keep them natural

Try it in the app →API reference →