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Like many developers, indie authors, and digital publishers, I spent years wrestling with ebook validation. If you’ve ever tried publishing an EPUB to Apple Books, Kobo, or KDP, you know the nightmare: cryptic EPUBCheck codes, broken manifests, and endless manual tweaking in Sigil or Calibre.
Most tools either require heavy desktop software, charge subscriptions for basic fixes, or force you to upload your unpublished manuscripts to a third-party server.
I built EPUB Inspector to fix this once and for all—right inside your browser.
At the core of the suite is the EPUB Fixer engine, built to eliminate validation headaches without guesswork:
🎯 32 Guided Repairs: For ambiguous issues that need an author's judgment (OPF-029, RSC-007, PKG-020, ACC-002...), the tool presents a visual diff so you confirm the exact resolution.
🔒 100% Client-Side Privacy: Your files never touch a remote server. Everything—validation, WebAssembly repair, CSS inspection, and packaging—runs entirely in local browser memory.
⚡ Complete Toolkit: Real-time EPUB 2 to EPUB 3 conversion testing, metadata & cover editing, and instant visual structure exploration.
It's completely free, requires no sign-up, and is built on open web standards.
I’d love for the PH community, authors, and frontend devs to put their broken EPUBs through it!
What’s the most frustrating EPUBCheck error code you’ve had to resolve? Any tools you’d like to see next?
EPUB Inspector was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #409 on the daily leaderboard. Free in-browser EPUB toolkit for authors and publishers. Inspect metadata, validate structure, calculate stats and extract covers — no uploads.
On the analytics side, EPUB Inspector competes within eBook Reader, Writing and Books — topics that collectively have 187.5k followers on Product Hunt. The dashboard above tracks how EPUB Inspector performed against the three products that launched closest to it on the same day.
Who hunted EPUB Inspector?
EPUB Inspector was hunted by EPUB Inspector - Walid Ben. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of EPUB Inspector including community comment highlights and product details, visit the product overview.
EPUB Inspector - Walid Ben
Hey Product Hunt! 👋
I'm Walid, creator of EPUB Inspector.
Like many developers, indie authors, and digital publishers, I spent years wrestling with ebook validation. If you’ve ever tried publishing an EPUB to Apple Books, Kobo, or KDP, you know the nightmare: cryptic EPUBCheck codes, broken manifests, and endless manual tweaking in Sigil or Calibre.
Most tools either require heavy desktop software, charge subscriptions for basic fixes, or force you to upload your unpublished manuscripts to a third-party server.
I built EPUB Inspector to fix this once and for all—right inside your browser.
At the core of the suite is the EPUB Fixer engine, built to eliminate validation headaches without guesswork:
🔧 128 Error Codes Auto-Fixed: One-click automated resolution for deterministic structural faults (e.g., RSC-005, PKG-026, OPF-014, HTM-004, CSS-002, NCX-001, NAV-010, and more...)
🎯 32 Guided Repairs: For ambiguous issues that need an author's judgment (OPF-029, RSC-007, PKG-020, ACC-002...), the tool presents a visual diff so you confirm the exact resolution.
🔒 100% Client-Side Privacy: Your files never touch a remote server. Everything—validation, WebAssembly repair, CSS inspection, and packaging—runs entirely in local browser memory.
⚡ Complete Toolkit: Real-time EPUB 2 to EPUB 3 conversion testing, metadata & cover editing, and instant visual structure exploration.
It's completely free, requires no sign-up, and is built on open web standards.
I’d love for the PH community, authors, and frontend devs to put their broken EPUBs through it!
What’s the most frustrating EPUBCheck error code you’ve had to resolve? Any tools you’d like to see next?
Looking forward to your thoughts and feedback! 🚀