Free Private Online Tools That Run in Your Browser

Transform raw screenshots into studio-grade marketing mockups with macOS frames, drop shadows, and 4K gradients in under 3 seconds.

Shrink heavy PNG, JPEG, and WebP files up to 80% without visible quality loss in 1 click.

Scale any image to exact pixel dimensions with locked aspect ratio and bicubic sharpness instantly.

Convert between WebP, PNG, JPEG, HEIC, AVIF, and BMP directly in browser memory with zero quality degradation.

Instantly translate color codes between HEX, RGB, HSL, HSV, CMYK, and OKLCH with 1-click clipboard copying.

Calculate cinema 21:9, golden ratios, and responsive 16:9 pixel dimensions with zero math in 2 seconds.

Assemble customizable lo-fi pixel art developer battlestations with monitors, keyboards, and pets in seconds.

Generate retro 8-bit dithered developer headers for GitHub, X, and LinkedIn with platform safe-zone overlays.

Convert any photo into authentic 1-bit vintage hardware bitmaps using Atkinson and Floyd-Steinberg dithering.

Isolate subjects and download transparent cutout PNGs in 2 seconds with on-device AI and zero server uploads.

Accurately predict finished video file size based on bitrate, audio, and duration before starting long renders.

Determine the exact optimal streaming and export bitrates for 4K, 1080p, Twitch, and YouTube uploads.

Calculate exact SSD, NAS, and camera card storage gigabytes needed for multi-hour ProRes and 4K footage.

Estimate exact transfer completion times for video files across fiber, 5G, and broadband connections.

Resolve broadcast, cinema, and anamorphic video dimensions with pixel-accurate letterbox/pillarbox padding.

Clean, indent, and format messy minified JSON strings with instant syntax highlighting and tree view in 1 click.

Catch syntax bugs in JSON with exact line and column error indicators and automated fix suggestions.

Convert raw text or binary image files into clean base64 data URIs ready for HTML/CSS embedding.

Decode base64 strings back to clean readable UTF-8 text or preview embedded images with zero lag.

Generate cryptographically secure RFC 4122 v4 and v7 UUID batches instantly using native browser Web Crypto.

Inspect JSON Web Token headers, payloads, claims, and expiry dates privately without transmitting tokens anywhere.

Convert Unix epoch seconds and milliseconds to human-readable UTC and local time in real time.

Test regular expressions with real-time syntax matching, capture group breakdowns, and regex flag toggles.

Compare meeting times across London, New York, Tokyo, and Sydney simultaneously with a single visual slider.

Find optimal overlapping working hours across multiple global time zones without schedule conflicts.

Calculate your exact chronological age in years, months, days, total hours, and next milestone.

Compute the precise calendar span between any two dates in days, weeks, months, and hours.

Calculate project delivery and deadline dates while automatically excluding weekends and bank holidays.

Break down gross annual salary into hourly, daily, weekly, bi-weekly, and monthly earnings instantly.

Determine the target hourly rate freelancers must charge to hit their annual revenue goals after overhead.

Solve percentage increases, discounts, margins, and proportion formulas with instant keystroke calculations.

Calculate sale prices, promotional discounts, coupon stack savings, and post-tax checkout totals in seconds.

Calculate gross margin, net profit margin, and product markup percentages for retail and SaaS revenue.

Simulate Return on Investment percentage, profit multiples, and annualized growth rates for projects.

Format and crop photos to exact Instagram Story (9:16), Feed (1:1, 4:5), and Carousel specifications in 1 click.

Format high-impact 1280x720 16:9 YouTube thumbnails with contrast checks and a guaranteed under-2MB file clamp.

Crop graphics to exact 1080x1920 9:16 vertical video dimensions with UI button safe-zone margin guides.

Fit images to company banner (1128x191) and feed document dimensions (1200x627) without distortion.

Resize images to standard X (Twitter) headers (1500x500) and in-stream post cards (16:9) instantly.