Free AI Tools — Prompts, Images & Documents

42 free AI tools for prompts, images, PDFs, audio/video and resumes — all processed in your browser. No sign-up, nothing uploaded.

AI Prompts

• Prompt Optimizer
  Analyzes your prompt across 12 dimensions — clarity, specificity, structure, tone — then rewrites it with smarter wording, explicit constraints and step-by-step framing.
• Prompt Builder
  A structured studio to compose role, context, task, format and constraints. Upload a requirements file and instantly generate tailored prompts.
• Prompt Generator
  Pick a category — writing, coding, analysis, marketing — and get ready-to-use prompts generated from your topic with one click.
• Prompt Database
  A searchable, filterable library of proven prompts across dozens of categories. Copy, favorite and use in seconds.
• Create Persona
  Craft rich AI personas — name, personality, voice, goals, knowledge — and export them as ready-to-use prompt presets.
• AI Humanizer
  Rewrite AI-generated copy into natural, conversational language — contractions, varied transitions, tighter phrasing and hidden-character cleanup. Paste text or upload a .txt/.md/.docx document (up to 50,000 characters) and export the result as a Word file. 100% local.

AI Skills

• Skills Database
  Browse a rich library of agent skills and instantly format them for opencode, Cursor, Claude, Hermes, ZCode and 50+ top AI tools.
• Skill Generator
  Describe a skill or upload documents, and generate a complete, production-ready skill definition with step-by-step workflow.

Image

• Snap ID Photo
  Turn any front-facing photo into a compliant passport, visa or ID photo — face detection, head-tilt fixing, background cleanup and exact cropping to official specs for 150+ countries. 100% private, nothing leaves your device.
• Compress Image
  Compress PNG, JPG, WebP, GIF and more with quality control and size caps. Auto-picks the smallest of JPG / WebP and never returns a bigger file than you started with.
• Image Resizer
  Resize any image to an exact width and height with presets for social and web, or a custom size. Fit, stretch or crop to fill — entirely on-device.
• Remove EXIF Data
  Strip camera info, GPS location, timestamps and other hidden metadata from JPEG, PNG and WebP images — without re-encoding, so pixel quality never changes. Entirely on-device.
• HEIC Converter
  Convert HEIC/HEIF photos from iPhone to JPG or PNG so they open on any device or app. Uses a bundled decoder that works in every browser, not just Safari — entirely on-device.
• Remove Object from Photo
  Brush over anything you want gone — a stranger, a cable, clutter — and AI inpainting (LaMa) reconstructs what should be there. 100% on-device, nothing leaves your browser.
• Background Remover
  Remove the background from any photo and download a transparent PNG. AI person segmentation via MediaPipe with a color-detection fallback for clean backdrops. 100% on-device, nothing leaves your device.
• Image Converter
  Convert between PNG, JPG, WebP, AVIF, GIF, BMP, ICO and SVG with quality control and optional resize. All processing happens on-device with Web Canvas — no uploads, ever.
• Image Upscaler
  Enhance images with smart 2x–8x upscaling, detail sharpening, denoising and face-friendly modes. 100% private — nothing leaves your device.

Audio & Video

• Audio Converter
  Convert audio between MP3, WAV, FLAC, ALAC, M4A, AAC, OGG, OPUS, AIFF and WMA with bitrate control. Also imports DSD (.dsf/.dff), WMA and more. FFmpeg runs in WebAssembly, right on your device.
• Video Converter
  Convert video to MP4, WebM, MKV, MOV, AVI, MPEG, FLV, WMV, 3GP or animated GIF — or extract the audio track. FFmpeg in WebAssembly, 100% local.
• Vocal Remover
  Remove vocals for karaoke or keep only the center channel. Pure phase-based center extraction with FFmpeg in WebAssembly — 100% on-device.

Documents

• Document Converter
  Convert between DOCX, PDF, Markdown, HTML, plain text and RTF with a clean, layout-aware result. Runs entirely in your browser — your documents never leave this device.
• Ebook Converter
  Create and convert ebooks between EPUB, PDF, TXT, Markdown and HTML. Read EPUBs and re-package them on-device — your reading stays private.
• Compress PDF
  Reduce PDF file size while preserving quality. Preserve text & forms for a clean re-pack, or re-render as image for maximum compression. If a pass would not shrink the file, you get your original back — never worse.
• Split / Merge PDF
  Split a PDF by ranges or every N pages into a zip, or merge multiple PDFs into one. Page-exact copy — zero quality loss.
• Merge CSV Files
  Combine several CSV files into one — columns are matched up by header name, so files with columns in a different order (or a missing column) still merge cleanly. Runs entirely in your browser.
• Merge Excel Files
  Combine several Excel workbooks into one — as a single combined sheet with columns matched by header, or keep every sheet separate in one merged workbook. Runs entirely in your browser.
• Fill Forms Online
  Detect AcroForm fields in any PDF and fill text, checkboxes, radio buttons and dropdowns — or click straight onto a page to type. Then download a flattened, print-ready PDF.

Finance

• Bank Statement to CSV
  Reads bank statement PDFs from any bank worldwide and extracts every transaction — date, description, debit, credit, balance — into a reliable CSV for spreadsheets, budgeting or data analysis. Parsed entirely on-device.
• Invoice Parser
  Reads any invoice PDF and extracts vendor, invoice number, dates, line items, subtotal, tax and total into an editable table you can export as CSV. Parsed entirely on-device.
• Receipt Parser
  Reads any receipt PDF and extracts merchant, date, line items, subtotal, tax and total into an editable table you can export as CSV. Parsed entirely on-device.
• Invoice Maker
  Build a clean invoice with vendor and client details, line items, tax and a due date, then download it as a print-ready PDF. Generated entirely on-device.
• Receipt Maker
  Build a clean receipt for any sale with line items, tax and notes, then download it as a print-ready PDF. Generated entirely on-device.

Career

• Resume Score
  Upload your resume, add a job listing by URL, file or pasted text, and get an instant holistic match score — skills, experience, seniority, education, competencies and resume quality. 100% on-device, nothing leaves your browser.
• Resume Optimizer
  Upload your resume and a job listing, get an algorithmically optimised version with enhanced action verbs, injected skills, embedded keywords and restructured sections. Edit the result and download as .docx or .txt.
• Cover Letter Generator
  Generate a cover letter draft from your resume and a job listing, with a tone selector and auto-detected company name and role — then edit and download as .docx or .txt. 100% on-device, nothing leaves your browser.
• Skill Review
  Review the skills auto-detected from your resume, confirm the ones that were missed and reject false positives — plus find more with an on-device AI skill-extraction model. Corrections are saved on this device and applied everywhere skills are scored.
• ATS Simulator
  Simulate how your resume parses through named ATS platforms — keyword analysis, evidence-backed terms, named-entity extraction (name, companies, locations) and heuristic parsing checks. 100% on-device, nothing leaves your browser.
• Batch Job Match
  Paste several job postings and score one resume against all of them at once, ranked side by side, so you can see which role you fit best. 100% on-device, nothing leaves your browser.
• Resume Templates
  Choose a visual resume template and layout density, then export a polished, ATS-friendly .docx or .pdf. 100% on-device, nothing leaves your browser.
• Resume Diff Viewer
  Compare two versions of a resume with word-by-word before/after highlighting — see every addition and removal at a glance. 100% on-device, nothing leaves your browser.
• Batch Resume Factory
  Upload one master resume and up to 10 job postings — get back one automatically tailored, ATS-safe resume per job, each capped at 3 pages. 100% on-device, nothing leaves your browser.
• Bullet Point Rewriter
  Paste one or more resume bullets and get AI-rewritten alternatives — quantified impact, more concise, or leadership-focused. On-device generative model, nothing is ever sent anywhere.

No account, sign-up, or login is required to use this tool -- everything is processed on your own device and is never sent to a server. See all free AI tools at utilAIfree.com.