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BrakeTools web utilities and studios

81 standalone tools and four dedicated studios.

documents

  • PDF Compressor — Compress large scanned PDFs entirely on your device — no upload, no size cap.
  • PDF Merge — Drag-and-drop reorder, delete, and merge pages across multiple PDFs into one file.
  • PDF Split — Mark boundaries in a drag-and-drop page grid and export as separate PDF files.
  • PDF OCR Reader — Extract selectable, searchable text from scanned documents, fully client-side.
  • Images ↔ PDF Converter — Combine images into a PDF, or split a PDF back into individual images — either direction, entirely on-device.
  • PDF Page Remover — Delete unwanted pages from a PDF and export the rest — drag to reorder first if needed, no page cap.
  • PDF Stamp — Add page numbers, Bates numbering, watermarks, headers/footers, and edit or strip metadata — entirely on-device.
  • PDF Studio — Read, search and fill PDFs, organize pages, recognize scanned text, redact and export in one persistent document workspace.
  • PII Redactor — Permanently black out SSNs, bank details, and names in a PDF — burned into the pixels, never an overlay.
  • Metadata Editor & Eraser — Edit PDF title, author and keywords, or remove document metadata and JPEG EXIF, GPS, IPTC and comments locally.

dev

  • JSON Formatter & Type Generator — Format, minify, and generate types from JSON payloads up to 100MB+, no freeze.
  • RegEx Visualizer & Builder — Build and test regular expressions safely with a ReDoS watchdog and railroad diagrams.
  • SQL Sandbox — Run queries and view a schema ERD against a local SQLite file, zero upload.
  • Cron Expression Builder — Build or explain UNIX, Quartz, and AWS EventBridge cron expressions in plain English.
  • JWT Decoder — Decode and optionally verify a JWT's header, payload, and signature — never transmitted.
  • Epoch / Unix Timestamp Converter — Convert between a Unix timestamp and a human-readable date, either direction.
  • SSL/TLS Certificate Decoder — Paste a PEM/DER certificate to inspect its subject, issuer, validity window, SANs, and key usage entirely client-side.
  • Subnet/CIDR Calculator — Compute network address, broadcast address, usable host range, and subnet mask for any IPv4 or IPv6 CIDR block.
  • Enterprise Password Policy & Hash Entropy Tester — Model a corporate password policy against real-world crack-time and entropy estimates.
  • File Extension Sorter — Drop in a folder or zipped repo and get back a ZIP organized into one folder per file extension.

media

  • Image Compressor — Batch-compress 100+ images locally with codec choice and a live SSIM preview.
  • SVG Vectorizer — Convert a raster logo into a clean, layered SVG, no subscription required.
  • Video Trimmer & GIF Maker — Near-instant clip trimming and crisp GIF export, entirely in your browser.
  • Image Studio — Compress, convert, and vectorize images in one persistent workspace.
  • Audio Studio — Convert, extract, record, and remix audio, plus a full multi-track editor for mixing, cutting, and generating noise/silence — in one workspace.
  • Video Studio — Trim, extract frames, and build multi-clip timelines with text/image overlays — all in one video workspace.
  • Audio Cutter — Drag in an audio file, select a range on the waveform or by typed start/end seconds, then remove or keep just that portion.
  • Voice/Sound Recorder — Record audio with a live mixing channel strip — gain, EQ, compressor, and noise gate — right in your browser.
  • Audio Converter — Convert between WAV, FLAC, AAC, OGG, and MP3 with title/artist/cover-art metadata carried over.
  • Audio Extractor — Pull just the audio track out of an MP4, MOV, or WebM video file.
  • Frame Extractor — Pull individual frames out of a video clip as a numbered image ZIP.
  • Nightcore/Daycore Music FX Player — A full effects-rack music player with one-click Nightcore/Daycore presets and offline export.
  • Image Converter — Batch-convert images between PNG, JPEG, WebP, and AVIF with a custom naming template.

hardware

  • Gamepad Tester — Full controller diagnostic: buttons, stick drift, triggers, rumble, health certificate.
  • Mouse Polling Rate & Jitter Studio — Accurate polling-rate and jitter measurement for 4,000–8,000Hz mice.
  • Keyboard Chatter & Switch Tester — Detect duplicate key presses, rapid switch chatter, stuck keys and keyboard rollover locally.

finance

  • Mortgage & Refinance Simulator — Full amortization schedule and refinance break-even, no lead-capture wall.
  • Freelance Invoicing — Track time and generate clean client invoices, no signup, no client book upload.
  • Digital Nomad Tax & Visa Matcher — Schengen day tracking and rough tax-residency estimates for remote workers.
  • Commercial Real Estate (CRE) Cap Rate Calculator — Compute cap rate and cash-on-cash return from NOI and purchase price.
  • Business Line of Credit vs. Term Loan APR Simulator — Compare a revolving line of credit and a fixed term loan side by side on effective APR and total interest.
  • Invoice Factoring Cost Estimator — See the real annualized effective APR behind a factoring company's flat discount rate.
  • Rental Yield Calculator — See gross and net rental yield, accounting for expenses and vacancy, not just the headline rent-to-price ratio.

workspace

  • Notepad — A distraction-free rich-text notes tool, zero account, zero cloud sync.
  • Drawpad — A freehand sketching canvas for quick diagrams, no install and no account.
  • Flashcards — A simple, free, no-login flip-card study tool with local deck persistence.
  • Quiz — Build and take multiple-choice, true/false, and short-answer quizzes, with AI-assisted question generation.
  • Tier List Maker — Build a drag-and-drop tier list with images or text, and export it as an image or a re-editable file.

generators

  • Mock Data & Fake Database Generator — Generate up to 250,000 rows of realistic test data locally, export as SQL, JSON, CSV, or Excel.
  • Branded Vector QR Code Designer — Design a branded, logo-embedded QR code with high error correction, no dynamic-link subscription.
  • CSPRNG Password & Diceware Passphrase Studio — Generate CSPRNG passwords or EFF Diceware passphrases, never transmitted over the network.
  • Bulk UUID/GUID Generator — Bulk-generate up to 10,000 RFC-compliant UUID v4 or v7 identifiers, copy or download instantly.
  • Vector Barcode Generator — Generate print-ready UPC, EAN, Code 128, ITF-14, and ISBN barcodes with automatic check digits.
  • Geographic Centroid & Coordinate Generator — Find a true geographic midpoint or generate uniformly random coordinates within a radius.
  • Filtered Random Word & Name Generator — Generate random words filtered by part of speech, syllable count, length, and starting or ending letter.
  • Credit Card / BIN Checksum Validator — Validate a card's Luhn checksum or grab a published Stripe/PayPal sandbox test number.
  • Random Sentence Generator — Generate random sentences and paragraphs from a grammar-template engine, in fully-random or controlled modes.
  • Random Number Generator — Generate cryptographically random integers or decimals in bulk, with a no-repeat mode.
  • Random ASCII Art Generator — Generate seeded, reproducible procedural ASCII art patterns you can copy or download.
  • Random Pixel Pattern Generator — Generate seeded, reproducible pixel-art patterns with configurable grid size and palette, exportable as PNG.
  • Random Synonym Generator — Find synonyms for a word from a bundled offline dataset, filtered the same way as the Word Generator.

calculators

  • Interactive 2D/3D Graphing Calculator — Graph Cartesian, polar, parametric, and implicit curves with live sliders, roots, and tangents.
  • 2D Kinematics & Projectile Physics Simulator — Simulate projectile motion with air drag and chaotic double-pendulum dynamics via RK4 integration.
  • Analog & Digital Circuit Simulator — Build a schematic and watch live current flow, voltages, and waveforms via an in-browser MNA solver.
  • Step-by-Step Symbolic Calculus Solver — See full step-by-step derivatives, integrals, and limits rendered in proper math notation.
  • Matrix & Linear Algebra Solver — Matrix multiply, invert, and solve linear systems with visible Gaussian-elimination pivot steps.
  • Universal Unit & Dimensional Converter — Convert instantly between 500+ units across 30+ physical dimensions, no dimension mismatch allowed.
  • Universal Multi-Variable Formula Solver — Type any formula, leave one variable blank, and solve it numerically via Newton-Raphson.
  • Probability Distributions & Hypothesis Testing Visualizer — Visualize probability distributions interactively and run one- or two-sample hypothesis tests.

cloud

  • Bandwidth Egress Calculator — Compare AWS, GCP, Azure, Cloudflare, and Bunny egress pricing by data volume.
  • Cloud Storage Price Comparison — Compare S3, R2, Wasabi, and Backblaze B2 storage pricing by GB-month and egress.
  • EC2 vs. Bare Metal ROI Calculator — Compare amortized total cost of ownership between a cloud VM and bare-metal hardware over a chosen horizon.

business

  • SOC 2 Audit Readiness Score — Self-assess your readiness against the SOC 2 Trust Services Criteria privately, with no signup and no server.
  • LTV:CAC Calculator — Compute customer lifetime value, acquisition cost, and their ratio against the industry-standard 3:1 benchmark.
  • MRR Growth & Churn Modeler — Project Monthly Recurring Revenue forward from new and churned MRR trends, and track net revenue retention.
  • ARR Valuation-Multiple Estimator — Get a rough valuation range from ARR and growth rate using typical SaaS revenue multiples.
  • Salary-to-Hourly & Overtime Calculator — Convert between annual salary and hourly rate, and compute overtime pay against a configurable threshold.
  • 1099 vs. W-2 Worker Classification Quiz — A private, IRS-factor-based indicator of whether a worker looks more like an employee or a contractor.
  • PTO Accrual Calculator — Project accumulated PTO balance over time given an accrual rate, pay frequency, and optional cap.

crypto

  • Classical Cipher Workbench — Encrypt, decrypt, and crack classic ciphers — Caesar, Vigenère, Playfair, Morse, and more — with step-by-step visualization.
  • Modern Symmetric Cipher Lab — Encrypt and decrypt with AES-GCM/CBC/CTR and PBKDF2, with byte-level and process-stage visualization.
  • Hash Lab & Identifier — Compute and identify SHA-1/256/384/512, HMAC, and MD5 hashes, verify file checksums, and test password strength.
  • RSA & Asymmetric Crypto Demo — Learn RSA with a full small-prime step table, or use real-strength RSA-OAEP encryption via your browser.
  • Enigma Machine Simulator — A historically accurate Enigma machine — rotors, reflectors, ring settings, plugboard, and live signal-path visualization.
  • Steganography Toolkit — Hide and extract secret messages inside PNG images using LSB embedding, with optional AES encryption.