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Photovoid — Privacy-first browser tools for images and PDFs
thegamer · 2026-06-12 · via Hacker News: Show HN

Image tools that keep quiet.

Metadata cleaning, conversion, compression, editing — everything runs right in the browser. Files do not leave your device. No accounts. Verifiable in DevTools.


Each tool lives on its own page. Drop an image, get the result, nothing leaves your device.

Conversion

Convert images between formats: HEIC, JPG, PNG, WebP.

Images → PDF

Combines multiple images into a single PDF. JPEGs are embedded without re-encoding.

PDF → image

Extracts PDF pages as PNG or JPG. Supports page ranges and batch mode — all pages bundled in a ZIP.

Animation splitter

Splits an animated GIF, WebP or APNG into individual PNG frames in a ZIP — with per-frame durations.

PDF pages

Extract and reorder PDF pages: drag-and-drop thumbnails, even/odd/reverse order, build a fresh file.

PDF merge

Merge several PDFs into one and reorder pages by drag-and-drop on thumbnails.

Batch converter PNG ⇄ JPEG ⇄ WebP ⇄ AVIF ⇄ BMP with quality control and a background for transparency.

Video frames

Extract one frame at a given time, or a regular series of frames from MP4, MOV, WebM, OGV.

Image to text (OCR)

Extracts text from an image right in your browser. Supports English, Russian, and both at once. The image never leaves your device — the OCR engine runs locally.

Rotate PDF

Rotates PDF pages by 90/180/270° without re-rendering. All pages or selected ones. The file never leaves your device.

PDF page numbers

Stamps page numbers onto a PDF: position, format, start, size. Lossless. The file never leaves your device.

PDF watermark

Adds a text watermark to every page of a PDF: text, angle, size, opacity. The file never leaves your device.

Sign PDF

Place a signature image onto a PDF: drag, resize, apply to one page or all. Lossless — text stays selectable. The file never leaves your device.

Crop PDF

Crops PDF margins: select an area or use auto-trim. Lossless (CropBox) — text stays selectable. The file never leaves your device.

PDF to text

Extracts the PDF text layer to plain text: view, copy, and download a .txt. Supports a page range. The file never leaves your device.

Compression

Reduce file size without noticeable quality loss.

Image compressor

Compresses JPG, PNG and WebP with an adjustable quality slider — see the trade-off live before saving.

Compress PDF

Compresses a PDF in the browser — pick a level (Strong / Balanced / Light). The file never leaves your device.

Editing

Basic operations: crop, resize, rotate.

Resize

Resizes images by exact pixel dimensions or percent, with optional aspect-ratio lock.

Crop Image

Crops an image to a rectangle you select with drag handles. Aspect-ratio presets included.

Rotate

Rotates an image by 90° increments or an arbitrary angle, with optional background color.

Blur region

Blurs or pixelates a rectangle you select — for hiding faces, plates, document numbers.

Watermark

Adds a text or image watermark — with batch support.

Image annotator

Arrows, rectangles, text, blur and black-box on top of a screenshot. For bug reports, instructions, privacy-safe sharing.

Auto-crop for social

Exact presets for Instagram, X, LinkedIn, YouTube, TikTok, Telegram, Facebook. Drag the frame; batch mode supported.

Background remover

Separates the subject from the background and outputs a PNG with transparency. Runs locally via a neural network — your file never gets uploaded.

Face blur

Detects faces on a photograph and obscures them with pixelation or blur. Runs locally via a neural face detector — the photo never leaves your device.

Circle crop

Crops a photo into a circle → PNG with transparent corners. For avatars and profile pictures.

Passport photo

Crops a photo to ID sizes (passport, visa, ID) and lays out a 4×6 print sheet. The file never leaves your device.

Round image corners

Rounds image corners to a transparent PNG. Modes: rounded corners and squircle (iOS-style). The file never leaves your device.

Add border to image

Adds a solid border: thickness (in %), color, outside/inside mode. Native canvas; the file never leaves your device.

Photo Collage

Combines multiple photos into one collage: layout, spacing, background, rounded corners. In the browser, with no server upload.

Replace Photo Background

Uses a neural network to separate the subject and place it on a new background: a color, transparent background, or your own image. In the browser, without uploading to a server.

Upscale image (AI)

A neural network enlarges your photo in the browser — typically ×4, with detail painted in. Nothing uploaded.

Overlay image on photo

Places one image on top of another: drag, resize, rotate, set opacity. Nothing uploaded.

Merge images into one file

Joins several JPG/PNG into a single file — vertically or horizontally, in your order. Nothing uploaded.

Color

Color tools: grayscale, eyedropper, image palette.

Grayscale

Converts an image to grayscale with a choice of luminance weights.

Eyedropper

Picks the color of any pixel — HEX, RGB, HSL.

Color palette

Extracts dominant colors: 2–16 hues sorted by area share.

WCAG contrast checker

Checks contrast between two colors against WCAG 2.1 — AA and AAA for normal and large text.

Image histogram

Visualizes the tonal distribution across R/G/B and luminance channels with median, mean and clipping percentages.

Color blindness simulator

Shows how your image looks to people with color vision deficiency: protanopia, deuteranopia, tritanopia, achromatopsia.

Colorize photo

Colorizes a black-and-white photo with a neural network, right in the browser. The color is a plausible reconstruction, not the real colors. The file never leaves your device.

Utilities

Helper tools: grid splitting for social media, QR codes, graphics generation.

Favicon generator

Generates the full favicon set from a single PNG or SVG: ICO, PNGs at all standard sizes, apple-touch-icon.

Cut photo into pieces

Cuts an image into pieces: Instagram grid tiles or A4 sheets for poster printing (with glue overlap). ZIP output, nothing uploaded.

Pixel diff

Compares two images pixel-by-pixel and shows exactly where they differ.

File hash

Computes MD5, SHA-1, SHA-256, SHA-384, SHA-512 locally in the browser. Useful for verifying downloads.

QR scanner

Decodes QR from a picture or live camera. Understands links, Wi-Fi configs, vCard contacts, coordinates and plain text.

Base64 file encoder

Two-way converter: file → base64 (with or without data:URL prefix), base64 → binary file with any name.

Steganography detector

Heuristic LSB stego detector for PNG, BMP and JPEG: chi-square test on colour pairs plus a visual least-significant-bit map.

PNG steganography

Hide AES-GCM-encrypted text or a file inside the LSB bits of a PNG. Companion to stego-detect.

Image hash

Perceptual hash (aHash, pHash, dHash) for finding visually similar images without a server.

WiFi QR code

QR code for WiFi auto-connect with proper escaping of special characters in SSID and password.

Draw a signature with mouse or finger → transparent PNG. Your signature never leaves your device.

Type a name and turn it into a script signature in a handwriting font → transparent PNG. The name never leaves your device.

Password-Protect PDF

Add a password to a PDF with AES-256 encryption — right in your browser, without uploading it to a server. Suitable for confidential documents.

Remove Password from PDF

Removes a known password from a PDF (you need to enter it) — entirely in your browser, without uploading the file to a server.

Check PDF Password

Checks whether a PDF is password-encrypted and whether the specified password works — in the browser, with no server upload.

Monogram Generator

Creates a monogram from 1–3 initials: style, color, transparent PNG. In the browser, with no server upload.

Seal Generator

Builds a round seal: curved text + center text, transparent PNG. A layout for forms, in the browser. Not for forging official seals.

All tools in one list →



Why this is safe

Files don’t leave your device

Processing runs in the browser via JavaScript. The image stays on your device — no upload needed.

No accounts, no file database

No accounts, no login. The server doesn’t receive your images, doesn’t store them, and doesn’t pass them to third parties.

Verifiable in DevTools

Open DevTools, the Network tab, and run a tool: not a single request sends your file to a server. Anyone can verify it.

Coming soon toGoogle Play