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Free webcomic thumbnail cropper

Crop one illustration into platform-size thumbnails

Crop, reposition, preview, and export WEBTOON CANVAS and Tapas series, cover, banner, and episode thumbnails from one private local illustration.

Use the free tool
No signupNo watermarkRuns in your browser

All official presets, crop controls, and local JPEG or PNG exports work without signup. Confirm final production rules with your printer or publishing platform.

Last verified: 2026-08-31Official Creator Resource Handbook — episode body limitsOfficial WEBTOON Academy handbook entryOfficial CANVAS thumbnail sizes and limitsOfficial CANVAS preview checklistOfficial Tapas file-size overviewOfficial Tapas comic episode publishing guideOfficial Tapas series asset requirementsOfficial Tapas Content & Community Guidelines

Connected creator workflow

Move to the next production step

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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 tool

Webtoon 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 tool

Webcomic Platform Converter

Compare WEBTOON CANVAS, Tapas, and GlobalComix output plans, resize a private master without forced upscaling, and export supported local variants.

Open Webcomic Platform Converter Free browser tool

Webtoon Format Checker

Check webtoon images for platform width, height, format, file-size, episode-total, and file-count rules with a private browser-based validation report.

Open Webtoon Format Checker Free browser tool

Smart 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 tool

Webtoon 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
Continue in LlamaGenCreate the complete episode in Manga MakerTurn publishing constraints into a reusable vertical-comic project with consistent characters and scenes.Open workflow

Continue in LlamaGen

Create the artwork behind every thumbnail

Use LlamaGen to build consistent characters, editable scenes, and complete vertical-comic episodes in one reusable story workspace.

Open the LlamaGen workflow Explore LlamaGen plans

Official presets

Use date-checked WEBTOON CANVAS and Tapas dimensions with visible source links.

Independent crops

Pan and zoom the original for square, vertical, cover, banner, and episode contexts.

Size feedback

See the actual encoded byte size before downloading the final local asset.

Webtoon Thumbnail Maker FAQ

Production answers without the guesswork

Which WEBTOON thumbnails are included?+

Square series, vertical series, and the currently recommended episode-thumbnail preset are included.

Which Tapas assets are included?+

Series thumbnail, book cover, series banner, and episode thumbnail presets are included.

Does this tool guarantee content-policy approval?+

No. It prepares image mechanics only; review each platform's current thumbnail and content rules.