24 tools for DTP, graphic design, and web development.
All browser-based — no uploads, no registration required.
hivivih.com is a free online tool hub for anyone working with print and web design. We offer 24 tools covering resolution checking, image conversion, QR code generation, contrast checking, and more — all running entirely in your browser with no file uploads or server storage.
Filter by category or click any tool to get started instantly.
Automatically calculates the maximum printable size from your image's pixel dimensions. Instantly checks print suitability for A4, A3, postcard, and other standard paper sizes.
Calculates the required pixel count from a desired print size and DPI. Instantly answers "how many pixels do I need to print at 300dpi on this paper size?"
Visually compares international standard paper sizes such as A4, B4, and A3 to scale. Intuitively understand actual size differences at a glance.
Previews HTML code in real time in the browser. Write code and instantly see the rendered output — great for debugging and quick testing.
Converts between image formats including JPG, PNG, WebP, and GIF — all in the browser with no server uploads.
Automatically extracts dominant colors from an image and generates a color palette. Useful for verifying brand colors and planning design color schemes.
Reduces image file size while maintaining quality. Ideal for improving web page load speed and reducing file sizes for email attachments.
Resizes images to a specified pixel size. Supports conversion to SNS post sizes, banner sizes, and aspect-ratio-preserving resizes.
Crops any region of an image. Supports SNS header ratios, square icon crops, and thumbnail extraction.
Rotates and flips images at 90°, 180°, or any custom angle. Also supports automatic correction of iPhone EXIF orientation issues.
Makes a solid-color background transparent and saves as PNG. Tolerance control lets you remove similar colors in one pass.
Overlays text or a logo on an image. Freely adjust position, opacity, and angle — great for proof submissions and sharing draft images.
Converts HEIC/HEIF images taken on iPhone to JPG or PNG. Supports batch conversion of multiple files.
Side-by-side comparison of the original image, WebP, and AVIF formats. Simultaneously view file size reduction rates and visual quality.
Validates the contrast ratio of text and background colors against WCAG 2.1 standards. Determines AA/AAA compliance for web accessibility.
Instantly generates a QR code by simply entering a URL or text. Download as PNG for use in print materials or websites.
Visually configure gradients and auto-generate CSS code (linear-gradient / radial-gradient). Copy and paste directly into your project.
Generates favicons, Apple Touch Icons, and PWA icons from a single image. Also auto-generates the HTML snippet — ready to use immediately in web projects.
Automatically checks if your image meets recommended sizes for X (Twitter), Facebook, LINE, note, and other platforms. Helps optimize per-platform sharing.
Calculates the aspect ratio from video or image width and height, and computes alternative resolutions while maintaining the ratio. Supports common ratios like 16:9 and 4:3.
Converts text or image data to and from Base64 format. Useful for embedding inline images in CSS as data URIs or for email attachments.
Removes unnecessary comments, metadata, and whitespace from SVG files to reduce file size. Also supports optimization for inline embedding.
An in-depth guide covering the mechanics of resolution (PPI/DPI), how to prepare print-ready files, and a checklist for avoiding common mistakes. Essential reading from beginners to DTP professionals.
A practical guide to image formats, resolution, and accessibility essentials for web design. Covers everything web designers and coders need in day-to-day work.
Simply select an image file to automatically calculate the maximum printable size.
🔒 Images are processed in the browser and never uploaded or stored on any server
Click or drag & drop image to analyze
Supports JPG, PNG, TIFFFind the right tool for your needs by use case, features, and target user at a glance.
Common questions about hivivih.com tools.
Resolution (PPI: Pixels Per Inch) is a metric indicating the number of pixels per inch, and it is the key value that determines the sharpness and clarity of a printed piece. The larger the print size for the same image, the fewer pixels per inch — and the grainier the result.
PPI (Pixels Per Inch) is a unit representing the resolution of a digital image — how many pixels are lined up within one inch. In the printing industry, 300 PPI or higher is considered high quality; below that, dots become visible in the printed piece.
DPI (Dots Per Inch) refers to the density of ink dots from a printer, while PPI (Pixels Per Inch) refers to the pixel density of a digital image. DPI is used for printer specs; PPI is used to check image quality. In practice, they are often used interchangeably. See Print Knowledge for more details.