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Quick read
Choose by capability, not by a blanket “best” claim.
Grand Print
People who want local image processing, broad image and single-page PDF input, detailed tile geometry, and PDF or JPG ZIP output.
Block Posters
People who want a straightforward JPG/PNG-to-PDF workflow and accept server upload.
Side by side
What the reviewed product pages actually document.
A missing documented feature is described as “not documented,” not as proof that the feature can never exist. Each cell links to its supporting page.
| Criterion | Grand Print · grandprint.app | Block Posters · blockposters.com |
|---|---|---|
| Price and watermark | Free, with no account, watermark, paid tier, or feature unlock. Support is optional. Grand Print support policy | Its FAQ says a poster can be created free. The creator currently presents a $5 Premium option whose listed benefits include watermark removal, uploads up to 5 MB, and posters up to 10 pages wide. Block Posters creator |
| Image processing location | Selected files, examples, previews, and output stay in the browser. Grand Print privacy model | Its terms say images are uploaded to its server, kept in a temporary directory, and later deleted. The terms also describe request logging and cookies. Block Posters terms, privacy section |
| Documented inputs | JPEG, PNG, WebP, TIFF, and HEIC/HEIF (iPhone/Samsung camera image) images, all decoded on the device by the bundled engine, so HEIC needs no conversion step and no browser HEIC support. PDF input is accepted as well: page 1 is rendered on the device at print resolution and later pages are ignored. Grand Print source-file help | The creator lists JPG and PNG. The displayed Premium benefit allows uploads up to 5 MB. Block Posters creator input copy |
| Crop, rotate, and editing | EXIF orientation, manual quarter-turn rotation, uncropped image placement, four split-origin corners, grid phase, and reversible sheet exclusion. Grand Print layout controls | The workflow documents image crop, portrait/landscape output, and border/borderless setup. Block Posters customization workflow |
| Resampling or upscaling language | Optional, cap-gated one-time 2× Lanczos resampling. It is described as resampling, not as recovering missing detail. Grand Print image-quality help | Its FAQ recommends a larger source or a smaller final poster when output looks pixelated; no upscaling feature is documented. Block Posters image-quality FAQ |
| Paper and layout controls | A5–A1, B4, Letter, Legal, Tabloid, and validated custom paper; margins, overlap, orientation, decimal sheet spans, physical target size, marks, labels, anchors, and tile exclusion. Grand Print layout controls | One to ten pages wide, portrait/landscape, A4/Letter, border or calibrated borderless output, and per-edge border settings are shown. Block Posters layout controls |
| Output formats | Raster multi-page PDF and coordinate-named JPG tiles in a ZIP. Grand Print export help | Its terms document PDF output. JPG ZIP output is not documented in the reviewed workflow. Block Posters service description |
| Documented limits | Adaptive byte, pixel, dimension, page-count, storage, and device-tier limits are shown before selection; there is no universal file-size guarantee. Grand Print limits answer | The creator advertises Premium uploads up to 5 MB and posters up to 10 pages wide; the reviewed page does not clearly state the free-tier numeric caps. Block Posters displayed Premium limits |
Price and watermark
Free, with no account, watermark, paid tier, or feature unlock. Support is optional.
Grand Print support policyIts FAQ says a poster can be created free. The creator currently presents a $5 Premium option whose listed benefits include watermark removal, uploads up to 5 MB, and posters up to 10 pages wide.
Block Posters creatorImage processing location
Selected files, examples, previews, and output stay in the browser.
Grand Print privacy modelIts terms say images are uploaded to its server, kept in a temporary directory, and later deleted. The terms also describe request logging and cookies.
Block Posters terms, privacy sectionDocumented inputs
JPEG, PNG, WebP, TIFF, and HEIC/HEIF (iPhone/Samsung camera image) images, all decoded on the device by the bundled engine, so HEIC needs no conversion step and no browser HEIC support. PDF input is accepted as well: page 1 is rendered on the device at print resolution and later pages are ignored.
Grand Print source-file helpThe creator lists JPG and PNG. The displayed Premium benefit allows uploads up to 5 MB.
Block Posters creator input copyCrop, rotate, and editing
EXIF orientation, manual quarter-turn rotation, uncropped image placement, four split-origin corners, grid phase, and reversible sheet exclusion.
Grand Print layout controlsThe workflow documents image crop, portrait/landscape output, and border/borderless setup.
Block Posters customization workflowResampling or upscaling language
Optional, cap-gated one-time 2× Lanczos resampling. It is described as resampling, not as recovering missing detail.
Grand Print image-quality helpIts FAQ recommends a larger source or a smaller final poster when output looks pixelated; no upscaling feature is documented.
Block Posters image-quality FAQPaper and layout controls
A5–A1, B4, Letter, Legal, Tabloid, and validated custom paper; margins, overlap, orientation, decimal sheet spans, physical target size, marks, labels, anchors, and tile exclusion.
Grand Print layout controlsOne to ten pages wide, portrait/landscape, A4/Letter, border or calibrated borderless output, and per-edge border settings are shown.
Block Posters layout controlsOutput formats
Raster multi-page PDF and coordinate-named JPG tiles in a ZIP.
Grand Print export helpIts terms document PDF output. JPG ZIP output is not documented in the reviewed workflow.
Block Posters service descriptionDocumented limits
Adaptive byte, pixel, dimension, page-count, storage, and device-tier limits are shown before selection; there is no universal file-size guarantee.
Grand Print limits answerThe creator advertises Premium uploads up to 5 MB and posters up to 10 pages wide; the reviewed page does not clearly state the free-tier numeric caps.
Block Posters displayed Premium limitsReview register
Other independently checked poster tools.
Rasterbator, PrintTiler, Block Posters, and Docuslice are each kept as a separate, source-linked record.
The Rasterbator · rasterbator.net
The long-running .net workflow combines plain enlargement with configurable halftone styles.
Review source for rasterbator.netDocuslice · docuslice.com
A multi-platform canvas editor for tiled images and documents, with free and paid feature tiers.
Review source for docuslice.comPrintTiler · printtiler.com
A local-processing photo tiler with a size-limited watermarked free tier.
Review source for printtiler.comSources used for the main comparison
Checked on . Prices, limits, and features may change after that date.
What this page does not claim
- It does not claim Grand Print is faster; no controlled cross-product benchmark supports that.
- It does not claim every competitor uploads images; several reviewed tools document local processing.
- It does not treat “private,” “free,” or “no watermark” as equivalent across separate domains.
- It does not copy another product's branding, wording, interface, code, or assets.