Creator & print

Make the file fit.

Small, practical checks for the last mile between an idea and a publishable listing or file. Calculations happen in your browser; nothing is uploaded.

Browse the shelf

Shopify variant limit calculator — multiply option values, subtract excluded combinations, and check the current per-product variant ceiling.
Etsy digital download file checker — inspect local file count, type, and byte size before attaching files to a digital listing.
Amazon backend keyword byte counter — measure UTF-8 bytes and find repeated, punctuated, or visible-copy terms before pasting search terms.
Amazon FBA carton size checker — test carton dimensions and weight against current shipment-box guidance and lift-label thresholds.
Shopify inventory CSV validator — compare local inventory files for duplicate rows, stale quantities, missing identifiers, and dangerous zeroing.
Shopify product CSV splitter — split an oversized product export without separating variants or image rows from their product handle.

Etsy listing video preflight — check a local video’s format, size, duration, resolution, and aspect ratio.
Etsy title + 13-tag checker — inspect the title and every tag against current limits without a made-up SEO score.
KDP paperback cover calculator — spine width, bleed, full-cover dimensions, and 300 DPI pixel targets.
Subtitle QA checker — KDP title/subtitle length plus SRT or WebVTT cue duration, CPL, CPS, ordering, and overlap checks.
SRT to VTT converter — convert SubRip to WebVTT or back, with an optional timing shift, locally.
YouTube chapter validator — normalise pasted timestamps and check the 00:00 start, three-chapter, ascending and 10-second rules.

Podcast bitrate & file-size calculator — estimate bytes, MB, and MiB from runtime and bitrate.
Podcast RSS feed validator — paste feed XML for line-numbered XML errors and the RSS 2.0 and Apple Podcasts checks.
Podcast chapters JSON generator — build a valid version 1.2.0 chapters file and the podcast:chapters feed tag.
Image DPI & print-size checker — inspect a local image’s pixels and embedded density, then test a target print size.
Google Merchant image checker — batch-check local product images against Merchant Center size, byte, format, and animation limits.
Print bleed & safe-area calculator — turn trim size into a file canvas and content-safe rectangle with KDP and commercial presets.

Booklet page count & imposition planner — round to a multiple of 4, count sheets and blanks, and list saddle-stitch imposition or 16/32-page signatures.
Etsy image size checker — batch-check listing photos for format, 2000 px size, first-photo minimum, transparency, and crop-safe centre.
PDF box checker — inspect local MediaBox, CropBox, TrimBox, and BleedBox values page by page.
Google Merchant feed validator — check a local TSV or CSV product feed for required attributes, price and availability format, length limits, duplicate ids, and GTIN check digits.
Podcast cover art checker — test local artwork against Apple Podcasts size, file type, and alpha-channel rules with a phone-size preview.
eBay title & subtitle checker — live 80- and 55-character counters, mobile truncation preview, and repeated-word and ALL-CAPS notes.

Shopify CSV preflight — check a product import CSV for header, encoding, handle, variant, Status, image, price and inventory problems, then export a row-level error CSV.
Variant & SKU collision checker — find duplicate normalized SKUs, barcodes, GTINs and product-option combinations.
Marketplace image compliance checker — compare local image headers with published Google, Shopify, Etsy and Amazon technical limits.

References checked 30 September 2026: Etsy listing-video requirements, Etsy tag rules, KDP cover sizing, Apple Podcasts audio requirements, the W3C WebVTT specification, and Adobe’s PDF reference.

References checked 29 September 2026: KDP cover sizing, KDP metadata, Apple Podcasts audio requirements, the W3C WebVTT specification, Etsy image requirements (30 September 2026), and Adobe’s PDF reference.