Utility collection

Utility tools

Useful everyday tools, with file processing kept in your browser.

Barcode Generator Create Code 128, Code 39, EAN, UPC and ITF barcodes. Adjust the appearance and download SVG or PNG. Unlimited Free Usage

ZIP Creator & Extractor Create ZIP archives or inspect and extract selected files from a ZIP. Files are processed on your device. Unlimited Free Usage

Subtitle Editor & Converter Edit subtitle text and timing, shift cues and convert SRT to WebVTT or VTT to SRT locally in your browser. Unlimited Free Usage

Text Comparison Tool Compare two texts by line or word. Highlight additions and removals and download a local text comparison report. Unlimited Free Usage

Word Counter & Text Cleaner Count words and characters, change text case, clean whitespace and remove duplicate lines without uploading your text. Unlimited Free Usage

Audio Cutter & Joiner Trim and join audio files in your browser. Arrange clips, adjust volume, add fades and download a WAV without uploading audio. Unlimited Free Usage

JSON Formatter & Validator Validate, format or minify JSON locally. Explore a tree while preserving exact large numbers, key order and string escapes. Unlimited Free Usage

Password & Passphrase Generator Generate random passwords or six-to-twelve-word passphrases on your device using cryptographic browser randomness. Unlimited Free Usage

Screen Recorder Record a screen, window or browser tab with permission. Preview and download the recording locally, with optional shared audio. Unlimited Free Usage

Invoice Generator Create a professional invoice PDF locally with business details, line items, tax, discount and exact decimal totals. Unlimited Free Usage

Batch File Renamer Preview bulk file names with find and replace, numbering and case changes. Download renamed copies in a ZIP without changing originals. Unlimited Free Usage

Duplicate File Finder Find files with exactly identical bytes locally. Review duplicate groups and download one selected copy of each unique file in a ZIP. Unlimited Free Usage

File Checksum Verifier Calculate SHA-256 or SHA-512 file checksums on your device. Compare an expected digest and export exact hashes as TXT or JSON. Unlimited Free Usage

CSV Editor & Converter Edit tables, filter, sort and remove duplicates locally. Convert CSV, JSON and XLSX while preserving text, leading zeros and exact number spelling. Unlimited Free Usage

Markdown Editor Write Markdown with a live preview for tables, lists and code. Download Markdown or safe HTML and print to PDF locally without external content requests. Unlimited Free Usage

Resume & CV Builder Build a resume with three templates, reorderable sections and local PDF export. Save and import an editable JSON project without account storage. Unlimited Free Usage

Video to GIF Turn a short video segment into an animated GIF with trim controls, frame rate, size, color and looping options. Unlimited Free Usage

Video Frame Extractor Extract a frame at one timestamp or a series at regular intervals, with JPG/PNG export and an optional contact sheet. Unlimited Free Usage

How Helphonic handles your files

Tools labelled browser-only process file contents locally on your device. Other tools validate uploads, process them in private temporary storage, and remove them after the response. Each tool explains its processing method and limits. Accounts store usage and billing records—not document contents.