Rule-by-rule evidence
Every warning shows the observed value, required value, and repair path.
Free webcomic publishing utility
Check an entire webtoon episode before upload
Check webtoon images for platform width, height, format, file-size, episode-total, and file-count rules with a private browser-based validation report.
Use the free toolNo signupNo watermarkRuns in your browser
The full pass/fail report stays free and the episode never leaves your device. Confirm final production rules with your printer or publishing platform.
Connected creator workflow
Move to the next production step
Cluster hub
Continue in LlamaGenCreate the complete episode in Manga MakerTurn publishing constraints into a reusable vertical-comic project with consistent characters and scenes.Open workflow Webtoon Publishing Tools
Choose a destination, test a live episode sample, and move directly into free cutting, thumbnail, conversion, and specification tools for webcomic publishing.
Open Webtoon Publishing Tools Free browser toolSmart Webtoon Cutter
Analyze a long comic locally, suggest low-ink cut lines near the platform boundary, override every seam manually, and export numbered publishing slices.
Open Smart Webtoon Cutter Free browser toolWebtoon Splitter
Split a long webtoon or vertical comic into deterministic numbered image slices. Choose a slice height, export locally, then verify the files with the platform checker.
Open Webtoon Splitter Free browser toolWebtoon Resizer
Resize a long webtoon strip to a target upload width, inspect the exact output dimensions and 100% preview, then export locally as JPEG, PNG, or WebP.
Open Webtoon Resizer Free browser toolWebtoon File-size Compressor
Compress one webtoon image toward a target file-size limit with a local quality search, before-and-after size evidence, and a full-resolution artifact preview.
Open Webtoon File-size Compressor Free browser toolWebtoon Thumbnail Maker
Crop, reposition, preview, and export WEBTOON CANVAS and Tapas series, cover, banner, and episode thumbnails from one private local illustration.
Open Webtoon Thumbnail MakerContinue in LlamaGen
Create the next webtoon episode in LlamaGen
Generate consistent characters, edit sequential scenes, and produce a complete vertical-comic episode from one LlamaGen project.
Versioned profiles
Platform rules include their source URL and last verification date.
Episode-level QA
Check individual images plus total size and file count in one report.
Webtoon Format Checker FAQ
Production answers without the guesswork
Does the checker upload my webtoon?+
No. Image dimensions, types, and sizes are inspected locally in your browser.
Which platforms are supported?+
The first release includes versioned WEBTOON CANVAS and Tapas profiles with official source links and verification dates.
Can platform requirements change?+
Yes. Treat the profile as a checked snapshot and verify the linked official source before publishing.