Developer Data Tools
JSON, Java, SQL and cron utilities.
Fix subtitle encoding
Recover legacy text encodings such as GB18030, Big5 and Shift-JIS.
SRT ↔ VTT
Convert caption files in either direction.
Shift subtitle timing
Move every caption earlier or later.
Repair SRT
Normalize numbering and timestamps.
Extract subtitles
Extract text-based SRT subtitle streams from MOV, MP4 or MKV.
Burn subtitles into video
Render caption text into a short video using FFmpeg.
Batch subtitle fixer
Repair, shift and convert up to 25 SRT/VTT files in one download.
Fix CSV encoding
Read GBK, UTF-8, Big5 and Shift-JIS CSV files; export normalized UTF-8.
Fix CSV delimiters
Detect commas, tabs or semicolons; normalize quoting and rows.
CSV to Excel
Turn properly parsed CSV data into a downloadable Excel workbook.
Repair CSV quotes & rows
Best-effort repair for unclosed fields and inconsistent column counts.
View image metadata
Read camera model, timestamps, GPS and embedded text where available.
Remove EXIF & GPS
Remove JPEG or PNG metadata without re-encoding image pixels.
Compress an image
Try a target JPEG file size in the browser with adjustable dimensions.
HEIC to JPG
Convert HEIC/HEIF images to JPEG using the server when browsers cannot read HEIC.
Inspect photo & video metadata
Deep metadata inspection for HEIC, MOV, MP4, JPEG, PNG and more.
Remove photo & video metadata
Strip common EXIF, QuickTime and GPS metadata from supported photos and videos.
Edit photo & video metadata
Write titles, descriptions, capture dates and GPS metadata in supported files.
Extract Live Photo assets
Split a paired HEIC/MOV archive or extract a still frame from MOV.
Match Live Photo identifiers
Attempt to synchronize existing Apple still-image and MOV content identifiers.
STL & 3MF viewer
Preview STL or 3MF, inspect size, surface area and solid mesh volume.
3D printing cost
Material, electricity, printer time, waste and quote markup.
Filament remaining
Estimate grams and filament length by weighing a spool.
Fit & tolerance
Starting peg, hole and shrinkage compensation values.
G-code filament analyzer
Estimate filament length, weight and layer counts from G-code.
STL / 3MF to G-code
Slice STL and compatible 3MF projects into G-code using PrusaSlicer CLI.
Filament weight & length
Convert filament length to weight (or weight to length) by diameter and density.
JSON diff
Semantic JSON diff with added, removed and changed properties.
JSON to Java record
Generate typed nested Java records from an example JSON object.
Cron visualizer
Preview the next eight times a standard five-field cron job runs.
SQL to JSON
Turn simple INSERT ... VALUES SQL literals into JSON arrays.
Java to JSON Schema
Convert basic Java fields or record parameters into JSON Schema.
Protobuf inspector
Inspect protobuf wire fields without inventing schema types.
Protobuf to JSON
Decode binary Protobuf properly using the supplied message schema.
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