Your files never leave your device. All processing happens locally in your browser.
How do I make a poster online for free without uploading my photos?
Open the Poster Maker, pick a true size (A4, A3, A2, US Letter, Tabloid 11×17, 18×24, 24×36, or Instagram / Story / Pinterest / Facebook / YouTube) in portrait or landscape, and start from an event, sale, concert, quote, minimalist or hiring template. Add editable text, shape and uploaded-image layers over a solid, gradient, pattern or photo background, then drag to move, grab a corner to resize, use the top dot to rotate, and re-order, lock, duplicate or delete layers. When it looks right, download a high-resolution PNG at the poster’s full pixel size or a one-page PDF. Everything — including your photos — is composited on your device; nothing is uploaded to a server or CDN.
True print + social sizes at 96 / 150 / 300 DPI, portrait or landscape
Editable text (font, size, weight, colour, align, line-height, letter-spacing), shapes & image layers
Drag, corner-resize, rotate, z-order, lock, duplicate, delete; arrow-nudge & Ctrl+D
Solid, linear/radial gradient, generated pattern or uploaded-photo backgrounds
Export hi-res PNG or one-page PDF, rendered locally — uploads never leave the browser
What is
Poster maker
A poster maker is a design editor for laying out a single large-format graphic — a printed poster (A-series, US Letter, Tabloid, 18×24 or 24×36 in) or a social graphic (Instagram, Story, Pinterest, Facebook, YouTube) — by compositing LAYERS of text, shapes and images over a background. The user sets a canvas at the correct aspect ratio and print resolution (DPI), then positions, sizes, rotates and stacks layers before exporting a high-resolution image (PNG) or PDF. This one runs entirely in the browser: layers are plain objects, the poster is drawn on an HTML5 canvas, and uploaded photos are composited locally and never sent to a server. It differs from a full print-shop workflow in that it exports a flat RGB raster without bleed, crop marks or CMYK.
No. Photos you add are read locally with URL.createObjectURL and drawn straight onto an in-browser canvas. Nothing is uploaded — there is no server or CDN in the editing or export path, and the tool works offline once cached.
The Poster Maker is 100% client-side. Every layer is a small typed object (position, size, rotation, colours, text or an image reference) held in the page. When you upload a photo it is turned into a local object URL and decoded into an in-memory Image, then composited onto an HTML5 <canvas> on your device — it is never transmitted. PNG export is a local canvas.toBlob at the poster’s full pixel size, and PDF export embeds that PNG into a one-page document in the browser with pdf-lib. No account, no tracking, no network calls except optional consent-gated ads. Close the tab and anything you did not download is gone.
It exports a flat RGB PNG or PDF at up to 300 DPI — great for home/office printing and screens. For a pro print shop it has no bleed or CMYK, so add a 3 mm bleed and convert colour in a prepress tool first.
You choose the export DPI — 96 for screen, 150 for draft prints, or 300, the industry standard for close-viewed print — and the tool shows the exact pixel dimensions (for example A4 at 300 DPI is 2480×3508 px, and 24×36 in is 7200×10800 px). That is more than enough for home, office or large-format desktop printing. However it exports a FLAT RGB raster with no bleed, no crop marks, no CMYK conversion and no spot colours, so for a commercial press you should add a 3 mm bleed and convert to CMYK in a dedicated prepress application before sending. Very large sizes use a lot of memory, so drop to 150 DPI on low-end devices if export is slow.
You pick from curated system font stacks (Helvetica, Segoe/Roboto, Georgia, Rockwell, Impact, Arial Narrow, Trebuchet, Courier). They render in your device’s version of each font, so keep the editable design if you need exact type on another machine.
To stay fully offline and private, the tool uses curated system font STACKS rather than downloading webfonts: a sans (Helvetica/Arial), a grotesk (Segoe UI/Roboto), a serif (Georgia), a slab (Rockwell), a display face (Impact), a condensed face (Arial Narrow), a rounded face (Trebuchet) and a monospace (Courier). Each stack falls back gracefully, but text is rendered with whichever version of the font your operating system provides, so the same poster can look slightly different on another computer, and there is no embedded font in the PNG. For each text layer you control the family, size, weight, colour, alignment, line-height and letter-spacing. If exact typography matters, keep your editable design and export on the machine that has the right fonts.
Yes. Select a layer, drag to move, grab a corner to resize, and use the top dot to rotate (Shift snaps to 15°). You can also change z-order, opacity, lock, duplicate (Ctrl+D), delete, and nudge with the arrow keys.
Each layer is fully editable on a live WYSIWYG canvas. Click to select, drag the body to move, drag any of the four corner handles to resize (text scales its font size proportionally; shapes and images resize freely), and drag the rotate dot above the box to spin it — hold Shift to snap to 15° increments. The layers panel lets you bring a layer forward or back, hide it, lock it so it can’t be moved by accident, duplicate it or delete it. Keyboard shortcuts include arrow keys to nudge (Shift for a bigger step), Ctrl/Cmd+D to duplicate and Delete to remove. Text layers expose font, size, weight, colour, alignment, line-height and letter-spacing; shapes expose fill, stroke, corner radius and size; images expose fit (cover/contain/fill) and corner radius.
Detailed Explanation
📖How It Works
What the Poster Maker Does
The Poster Maker is a 100% client-side poster design editor — a free, private alternative to popular design apps or PosterMyWall for a single poster. You pick a true size (A4/A3/A2, US Letter, Tabloid 11×17, 18×24, 24×36, or Instagram / Story / Pinterest / Facebook / YouTube) at 96/150/300 DPI in portrait or landscape, start from an event, sale, concert, quote, minimalist or hiring template, and composite editable text, shape and uploaded-image layers over a solid, gradient, pattern or photo background. Drag to move, grab a corner to resize, use the top dot to rotate, and re-order, lock, duplicate or delete layers on a live WYSIWYG canvas — then export a high-resolution PNG or a one-page PDF, all in the browser with nothing uploaded.
True print + social sizes at correct aspect and 96/150/300 DPI, portrait/landscape
Editable text (font, size, weight, colour, align, line-height, letter-spacing), shapes & images
A framework-free engine (posterMakerEngine.ts) holds the whole poster as plain typed objects and owns the geometry. All layer coordinates are stored in resolution-independent DESIGN UNITS on a fixed 1000-unit-wide virtual artboard whose height tracks the poster’s aspect ratio, so the same geometry drives the on-screen preview and every export size — only a scale factor differs. Crucially, ONE function, drawPoster(), paints the background and every layer (with per-layer translate/rotate/opacity and canvas clipping to the artboard) for BOTH the live preview and the export canvas, which guarantees the download matches the screen. Print sizes are physical inches multiplied by the chosen DPI; social sizes are fixed pixels.
Geometry stored in design units (1000-wide artboard) — resolution independent
A single drawPoster() renders the preview AND the export (true WYSIWYG)
Print px = inches × DPI; social sizes are fixed pixels (DPI ignored)
Per-layer translate + rotate + opacity, clipped to the artboard rectangle
Text height is kept in sync with wrapped content via a shared measuring context
🔧Technical Details
Interaction, Resize Math and Export Internals
Pointer input is mapped from screen pixels into design units via the canvas bounding rect, so hit-testing stays correct at any display scale. Moving a layer translates its position; corner-resize keeps the OPPOSITE corner fixed in world space by rotating the pointer into the box’s local frame, so rotated layers resize without drifting (text scales its font size proportionally, shapes and images resize freely); the rotate handle computes the angle from the box centre to the pointer, snapping to 15° with Shift. Backgrounds render as a solid fill, a canvas linear/radial gradient, a procedurally tiled pattern (dots, grid, diagonal, triangles, checker) or a cover/contain/fill photo. PNG export sizes an offscreen canvas to the poster’s full pixel dimensions and calls toBlob; PDF export decodes that PNG to bytes and embeds it, at the correct point size, into a one-page document with pdf-lib — both entirely in-browser.
Screen→design pointer mapping via getBoundingClientRect keeps hit-tests accurate
Corner-resize fixes the opposite corner in world space (correct even when rotated)
Rotate handle snaps to 15° with Shift; arrow keys nudge (Shift = larger step)
Patterns are procedurally tiled on canvas — crisp at any export scale, no assets
PNG = full-size canvas.toBlob; PDF = PNG embedded via pdf-lib at the right point size
📋Use Cases
When to Reach for This
Use it whenever you need a single poster fast and private: an event or gig flyer, a sale or promo, a hiring call-out, a quote graphic, a class or club notice, or a social post at the exact platform size. Because it runs entirely in the browser with your photos composited locally, it suits sensitive or personal imagery you would rather not upload to a design cloud, and it works offline once cached. Start from a template that is close to what you want, swap the text and colours, drop in your own photo or a gradient/pattern background, then export a 300 DPI PNG for the print shop counter or a screen-resolution PNG/PDF for sharing.
Great for event, gig, sale, hiring, quote and notice posters
Exact social sizes for Instagram, Story, Pinterest, Facebook and YouTube
Keeps sensitive photos on-device — nothing is uploaded
Works offline once cached; no account, no watermark
Template-first: adapt a starter, then export PNG or PDF
⚠️Limitations
Honest Limitations
This is a screen-and-home/office poster editor, not a prepress suite. It exports a FLAT RGB raster — a PNG, or that PNG embedded in a one-page PDF — with no bleed, crop marks, CMYK conversion or spot colours; for a commercial press, add a 3 mm bleed and convert colour in a prepress tool first. Text renders in your device’s version of curated system font stacks (no embedded webfont), so a font can look slightly different on another machine — keep the editable design if exact type matters. Export is done in memory, so very large sizes (24×36 in at 300 DPI is ~78 megapixels) need a lot of RAM and can be slow or fail on low-end devices; drop to 150 DPI for a lighter file. There is no multi-page layout and no cloud save — download your work before closing the tab.
Flat RGB raster only — no bleed, crop marks, CMYK or spot colours
Add a 3 mm bleed + CMYK in a prepress tool for professional printing
System font stacks (no embedded webfont); type can vary across machines
Very large sizes are memory-heavy — use 150 DPI on low-end devices
Single page, no cloud save; unsaved work is lost on tab close
🔒Privacy & Security
Private by Design
Everything happens on your device. Each layer is a small object of numbers, colours and text held in the page; the poster is drawn by a pure engine straight onto an in-browser canvas; and uploaded photos are read locally with URL.createObjectURL and composited on your machine. PNG export is a local canvas.toBlob and PDF export embeds that PNG in-browser with pdf-lib — there is no upload, no server and no CDN anywhere in the editing or export path, and the only optional network use is consent-gated ads. The tool works offline once cached, keeps no accounts and sets no tracking; close the tab and anything you did not download is gone.
Layers are local objects; the poster is drawn on an in-page canvas
Uploaded photos are composited locally — never transmitted
PNG = local canvas.toBlob; PDF = in-browser pdf-lib; no server or CDN
Works offline once cached; no accounts, no tracking
Unsaved work is discarded on tab close
Ways to make a poster
Approach
How it works
Trade-off
Used here
This client-side maker
Composite text/shape/image layers on an in-browser canvas, export PNG/PDF
Private + free + no watermark; flat RGB, no bleed/CMYK
Yes
Cloud design app (e.g. popular design apps)
Templates + assets in the cloud, exported from their servers
Huge asset library, but uploads your images and may watermark/paywall
