PDF Preflight Checker
Check your PDF for print-production issues before sending to press. The pdf preflight checker inspects bleed area, page size consistency, color output intent, image resolution, font embedding, and PDF version — all locally in your browser with no signup required.
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Why Use Our PDF Preflight Checker?
9 Automated Print Checks
The pdf preflight checker runs nine checks in one pass: PDF version, page size consistency, bleed detection, color output intent, image resolution, font embedding, orientation, metadata, and page count — all summarized in a clear pass/warn dashboard.
Color & Bleed Verification
Detect missing ICC output intents that cause color shifts at the printer. The pdf preflight checker also identifies whether your pages are larger than standard paper — the key signal that bleed has been added correctly.
Image Resolution & Font Embedding
Flags pages where estimated image DPI falls below 250 (print standard is 300 DPI). Checks font resources for subset embedding markers so you know which typefaces are safely locked into the PDF.
Private — No Upload, No Account
The pdf preflight checker processes your file entirely in your browser using pdf-lib. Your design files never leave your device. 100% free, no registration, and no file size limits.
When to Use the PDF Preflight Checker
Before Sending to a Print Provider
Run the pdf preflight checker on every file before uploading to an offset or digital print provider. Catch bleed, color profile, and resolution issues before they cause an expensive reprint.
Marketing Collateral Production
Brochures, flyers, and business cards have strict print specifications. Use the pdf preflight checker to verify bleed, trim, and color compliance before production runs.
Photo Book & Catalog Checks
Image-heavy publications need high-resolution embedded photos. The pdf preflight checker estimates per-page image DPI so you can identify low-resolution spreads before going to press.
Book & Magazine Layout Review
Run a pdf preflight check on multi-page layouts to verify consistent page sizes, uniform orientation, and proper font embedding across all chapters and sections.
CMYK / PDF/X Compliance
Check whether your PDF has an embedded output intent for ISO Coated, sRGB, or another color standard. The pdf preflight checker flags missing color profiles that cause unexpected color shifts at the RIP.
Design Student Submission Checks
Students and freelance designers use the pdf preflight checker to self-audit print-ready PDFs before submission to tutors, clients, or print vendors — catching common errors without professional prepress software.
Understanding PDF Preflight Checking
What is the PDF Preflight Checker?
The pdf preflight checkeris a free online tool that inspects PDF files for common print-production issues before you send them to a printer or service bureau. Traditional prepress preflight software (like Acrobat's Preflight or Pitstop) costs hundreds of dollars. Our pdf preflight checker brings the most critical checks — bleed, color intent, image resolution, font embedding — directly to your browser, completely free, with no file uploads and no account required.
How the PDF Preflight Checker Works
- Upload your PDF — drag and drop or click to browse. The pdf preflight checker loads your file entirely in your browser using pdf-lib. Nothing is transmitted to any server.
- Automated analysis— the tool reads the PDF's internal structure: page MediaBox dimensions, XObject image resources with pixel dimensions, font resource dictionaries with BaseFont names, the catalog's OutputIntents array for ICC profiles, and the document header for version number.
- Tabbed results dashboard — results appear across four tabs: Checks (pass/warn summary), Pages (per-page dimensions, bleed, DPI), Fonts (embedding status per typeface), and Color (output intent details).
What the PDF Preflight Checker Examines
- Bleed detection — compares page MediaBox size to the nearest standard paper size (A4, Letter, A3, etc.) and flags pages that are 3–7 mm larger, the typical bleed allowance.
- Color output intent — checks the PDF catalog for an OutputIntents entry with an embedded ICC profile. Missing output intents are flagged as warnings for print workflows.
- Image resolution estimate— reads each embedded image's pixel width and height from the XObject dictionary and divides by page size in inches to estimate DPI. Below 250 DPI triggers a warning.
- Font embedding status— identifies BaseFont names in the font resource dictionary. Font names containing "+" (e.g. ABCDEF+Helvetica) indicate subset embedding, which is the correct print approach.
Privacy, Limitations & Availability
The pdf preflight checker runs entirely in your browser — your PDF never leaves your device. As a client-side tool, it cannot detect every issue a dedicated prepress system would catch (e.g. spot color inks, PDF/X conformance, overprint settings, or hairline strokes). For critical commercial print jobs, always confirm with your print provider's preflight system. This tool is 100% free, requires no account, and has no file size limits.
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Frequently Asked Questions About PDF Preflight Checker
A PDF preflight checker examines a PDF for potential print production problems before sending it to a printer. Our pdf preflight checker verifies bleed area, page size consistency, color output intent, image resolution, font embedding, and orientation — all in your browser without uploading to any server.
The pdf preflight checker runs 9 automated checks: PDF version compatibility, page count, page size consistency, bleed area detection, color output intent (ICC profile), font embedding status, image resolution estimate, document metadata completeness, and orientation consistency. Results are shown as Pass, Warning, or Info badges.
Bleed is artwork that extends 3 mm beyond the final trim edge so that slight cutting variations do not leave white borders on the finished print. The pdf preflight checker detects bleed by comparing your page MediaBox to the nearest standard paper size — pages that are 6–14 points larger than standard likely have bleed included.
An output intent (embedded ICC color profile) tells the printer's RIP which color space your PDF targets — e.g. ISO Coated v2 for European offset printing or sRGB for digital press. Without an output intent, the RIP applies a default conversion that can shift colors unexpectedly. The pdf preflight checker flags missing output intents as a warning.
The pdf preflight checker reads pixel dimensions from each embedded image's XObject dictionary entry and divides by page dimensions in inches to estimate DPI. Results below 250 DPI are flagged as warnings. The professional print standard is 300 DPI for photographs and 1200 DPI for sharp line art.
Font embedding stores the font data inside the PDF so it renders identically on any printer. Subset embedding (signaled by a "+" prefix like "ABCDEF+Garamond") embeds only the characters actually used. Fonts without "+" may not be subset-embedded — verify embedding in your PDF creation software before printing.
No. The pdf preflight checker runs entirely in your browser using pdf-lib. Your PDF file never leaves your device — no server upload, no storage, no data transmission. Completely safe for confidential design work and proprietary print files.
Yes. The PDF preflight checker is 100% free with no registration, no account, and no file size limits. Run preflight checks on unlimited PDFs completely free, forever.