Your files never leave your device. All processing happens locally in your browser.
How do I check bleed, trim and safe zone on my print artwork — and whether it’s high enough resolution — without uploading the file?
Open the Print Bleed & Safe-Zone Checker and drop in your artwork (PNG or JPG); its pixel size is read locally in the browser. Pick the intended trim size (business card, postcard, A6 / A5 / A4, US Letter, poster, or a custom W×H in mm or inches) and orientation, set a bleed (default 3 mm / 0.125″), a safe margin and a target DPI (default 300). The tool overlays three proportional guides on your artwork — the bleed box (your artwork edge), the trim line (where it’s cut) and the inner safe zone — with crop marks and a legend, and reports the effective DPI (artwork pixels ÷ trim + bleed inches) against your target plus an aspect-ratio match. Download an annotated PNG to send your printer. Everything runs on your device; nothing is uploaded.
Reads your artwork’s pixel size locally — no upload, no server
Effective DPI = pixels ÷ (trim + bleed inches), flagged vs a target (default 300)
Warns when the aspect ratio doesn’t match (avoids a silent crop / stretch)
Download an annotated PNG; presets for business card, A-sizes, US Letter, poster + custom
What is
print bleed and safe-zone pre-flight
A bleed and safe-zone pre-flight is a quick visual check of print artwork before it goes to press: it confirms the design extends past the trim into the BLEED (so no white shows if the cut drifts), marks the TRIM line where the sheet is cut, and shows the inner SAFE ZONE where text and logos must stay, while verifying the file has enough resolution (effective DPI) at the final size. A 100% client-side version reads the uploaded image’s pixel dimensions in the browser, overlays the guides on an in-page canvas and computes the DPI and aspect-ratio maths locally — nothing is uploaded — but it is a guide, not a full pre-press RIP (it does not check CMYK, ink density, overprint, spot colours or embedded fonts).
Design
Related terms
bleedtrimsafe zonecrop markseffective DPIprint resolutionpreflightaspect ratioCMYKprint-ready PDF
Frequently Asked Questions
No. The image is decoded locally and drawn onto an in-page canvas, so nothing is uploaded.
The Print Bleed & Safe-Zone Checker is 100% client-side. Your artwork is read with the browser’s FileReader / Image APIs, its pixel dimensions are measured on-device, and the guide overlay and the downloadable annotated PNG are drawn on an in-page <canvas>. Nothing — not your file, not its dimensions — is fetched, uploaded, logged or stored on a server, and there is no CDN in the processing path. The tool works offline once cached, and your file is gone when you close the tab.
Bleed is the extra edge that gets cut off, trim is the finished cut line, and the safe zone is the inner margin that keeps content clear of the cut.
The TRIM is the final size of the printed piece — where the guillotine cuts. BLEED is background that extends past the trim (typically 3 mm or 0.125″) so that if the cut drifts slightly, no unprinted white edge appears; your artwork should fill this whole area. The SAFE ZONE is an inner margin (about 3–5 mm) inside the trim; keeping logos, text and key content inside it means a slightly off cut never clips them. The tool draws all three as nested guides over your artwork so you can see at a glance whether the design bleeds fully and whether content sits too close to the edge.
It computes effective DPI as your artwork’s pixels divided by the trim + bleed size in inches, then compares that to your target.
Print resolution is about pixels per inch at the FINAL size, not the raw pixel count. The tool divides your artwork’s width and height in pixels by the trim + bleed size in inches to get the effective DPI on each axis, then flags it: at or above your target (300 DPI is standard) it passes; a little under is usable at a viewing distance; well under will look soft or pixelated, and it tells you the exact pixel dimensions you need. Note that DPI alone doesn’t guarantee sharpness — an upscaled low-resolution photo can still look blurry even if the pixel count “passes”.
No. It catches common resolution / bleed / safe-zone mistakes but does not check CMYK, ink density, overprint, spot colours or fonts.
This is a visual guide plus a resolution and aspect-ratio check — it catches the most common and most expensive mistakes before you order. It is not a full pre-press RIP and deliberately does not verify CMYK vs RGB colour mode, total ink coverage, overprint, spot (Pantone) colours, transparency flattening or embedded fonts, and it cannot read crop marks inside a PDF. Use it as a fast sanity check, then confirm the exact trim, bleed, colour and file specifications with your printer before submitting your job.
Detailed Explanation
📖How It Works
What the Print Bleed & Safe-Zone Checker Does
The Print Bleed & Safe-Zone Checker is a 100% client-side print pre-flight. You drop in artwork (PNG / JPG); its pixel dimensions are read locally in the browser. You choose the intended TRIM size (business card, postcard, A6 / A5 / A4, US Letter, half-letter flyer, poster, tabloid, or a custom W×H in mm or inches) and orientation, a BLEED amount (default 3 mm / 0.125″), a SAFE margin (≈3–5 mm) and a target DPI (default 300). It then overlays three correctly-proportioned guides on the artwork — the BLEED box (the artwork edge), the TRIM line (where it is cut) and the inner SAFE ZONE — with corner crop marks and a legend, and reports the effective DPI and an aspect-ratio match. You can download an annotated PNG. Nothing is uploaded.
Reads artwork pixel size locally — no upload, no server
Trim presets (cards, A-sizes, US Letter, poster, tabloid) + custom mm / inch
Reports effective DPI vs a target and flags aspect-ratio mismatch
Exports an annotated PNG drawn on-device
⚙️Methodology
The Geometry & Resolution Maths
All sizes are reduced to canonical inches. The full artwork box is trim + 2×bleed on each dimension, and the guides are stored as FRACTIONS of that box (trim inset = bleed ÷ full; safe inset = (bleed + safe) ÷ full), so the same numbers place the on-screen overlay and the exported PNG regardless of scale — the artwork is assumed to fill the bleed box. Effective DPI is computed per axis as artwork pixels ÷ full inches; the tool reports the lower of the two and grades it: at or above target passes, down to roughly two-thirds of target (≈200 DPI for a 300 target) warns, and below that fails, always with the exact required pixel count. Aspect ratio compares the artwork ratio to the trim + bleed ratio within a ~1% tolerance and names the direction of any mismatch (wider → top/bottom cropped; taller → sides cropped; opposite orientation → rotate). The industry defaults it encodes — 3 mm / 0.125″ bleed, a 3–5 mm safe margin and a 300 DPI target — come from standard commercial-print practice.
Full box = trim + 2×bleed; guides stored as fractions of that box
Effective DPI = artwork pixels ÷ (trim + bleed) inches, taken per axis
Grades pass / warn (≈⅔ of target) / fail, with the exact pixels needed
Aspect check to ~1% names the crop / stretch direction or a rotation
Defaults: 3 mm / 0.125″ bleed, 3–5 mm safe, 300 DPI target
🔧Technical Details
Rendering & Export Internals
A pure, fully-typed engine (printBleedEngine.ts) holds the presets, unit conversions, computeGeometry / computeResolution / computeAspect and the runPreflight orchestrator, plus one browser-safe canvas helper, drawPreflight. drawPreflight sizes a canvas to the artwork plus padding, paints a light checkerboard so transparent PNGs read clearly, draws the artwork, then strokes the bleed edge (coral, solid), the trim line (teal, dashed), the safe zone (gold, dashed) and outward-pointing crop marks at the trim corners, and finally a legend. The SAME function drives both the live preview (artwork long side ≈600 px) and the downloadable PNG (≈1600 px), so what you see is what you export; single-file export is canvas.toBlob('image/png'). The artwork is decoded with the browser Image / FileReader APIs; a built-in sample is a local, on-brand inline SVG data URI sized to the current trim + bleed at 300 DPI (no network). Fonts in the legend are system stacks only.
printBleedEngine.ts: pure geometry / DPI functions + a canvas draw helper
One drawPreflight() paints the preview and the export (WYSIWYG)
PNG via canvas.toBlob; artwork decoded with Image / FileReader
Built-in sample is a local inline-SVG data URI — no network, system fonts
📋Use Cases
Who It Is For
It suits anyone sending artwork to a printer who wants a fast sanity check before ordering: a small business or solo designer preparing business cards, flyers, postcards or posters; a marketer checking that a social-designed graphic actually has bleed and enough resolution for print; a print-on-demand or KDP seller confirming a cover meets a trim + bleed spec; or a teammate who needs an annotated proof to discuss with a print shop. Because it is free, account-free and fully in-browser, it is also safe for confidential or client artwork that must not be uploaded to a cloud service. It is best used as a first-pass pre-flight to catch obvious resolution, bleed and safe-zone problems, after which the printer’s own spec is the final word.
Business cards, flyers, postcards, posters — cards to large format
Verify a social / screen graphic has bleed and print-grade resolution
Print-on-demand / KDP cover trim + bleed sanity check
Private and account-free — safe for confidential or client artwork
⚠️Limitations
Honest Limitations
This is a VISUAL guide plus a resolution and aspect-ratio check — not a full pre-press RIP. It reads bitmap pixel dimensions and geometry only, so it does NOT verify CMYK vs RGB colour mode, total ink coverage (TAC), overprint, spot (Pantone) colours, transparency flattening or embedded fonts, and it cannot open a PDF or read crop marks baked inside one. It assumes your artwork fills the bleed box, so it cannot tell whether your background truly extends to the edge, and because it does not inspect where your text sits, the safe-zone line is a reminder to check by eye, not an automated pass. Bitmap resolution alone does not guarantee sharpness: an upscaled 72 DPI photo can still look soft even when the pixel count “passes”. Trim, bleed and file requirements also vary by printer and product, so the tool is a first-pass sanity check — always confirm the exact specs with your printer before ordering.
No CMYK / ink density / overprint / spot-colour / font checks — not a RIP
Cannot open PDFs or read embedded crop marks; raster input only
Safe-zone line is a by-eye reminder, not automated content detection
High DPI ≠ sharp — upscaled low-res images still look soft
Specs vary by printer / product — confirm final specs before ordering
🔒Privacy & Security
Private by Design
Everything happens on your device. Your artwork is decoded locally with the browser’s Image / FileReader APIs, its pixel dimensions are measured on-device, and the guide overlay and the annotated PNG are drawn on an in-page <canvas> and saved with canvas.toBlob. Nothing — not your file, not its dimensions — is fetched, uploaded, logged or stored on a server, and there is no CDN in the processing path. The built-in sample is a local inline-SVG data URI, legend type uses the device’s own system fonts, and the tool works offline once cached, keeps no accounts and sets no tracking. Close the tab and your file is gone unless you exported it. The only optional network use is consent-gated ads.
Artwork decoded locally with Image / FileReader; dimensions measured on-device
Overlay + annotated PNG drawn on an in-page <canvas> via canvas.toBlob
No server, no CDN in the path; sample is a local inline-SVG data URI
System fonts only; works offline; no accounts, no tracking
Set document bleed + margins and export with crop marks
Authoritative at design time, but installed / paid and per-document setup
Alternative
Eyeball it
Judge bleed and resolution by looking at the file
No tools, but the most common cause of costly reprints
No
Everything here runs in the browser; your artwork is never uploaded. It is a visual + resolution guide, not a full pre-press RIP — confirm final specs with your printer. As of July 2026.
