CASTARA
File conversion tools
Choose a category, then select the tool that matches your input and required output. Each tool shows the file types it accepts.
Image tools
Compress, resize and change image formats.
Image Compressor
Shrink JPEG, PNG and WebP files with quality and dimension controls.
Open toolImage Resizer
Resize images using contain, cover or exact dimensions.
Open toolImage Converter
Change JPEG, PNG and WebP images to the format you need.
Open toolImage OCR
Extract English text from JPEG, PNG and WebP images privately in your browser.
Open toolPrice Tag Maker
Design a clear custom price tag with simple templates and download it as PNG.
Open toolGIF & animation tools
Create GIFs or extract their individual frames.
Images to GIF
Turn JPEG, PNG and WebP images into an animated GIF.
Open toolGIF to Images
Extract GIF frames as PNG, JPEG or WebP images.
Open toolGIF Optimizer
Reduce GIF size with balanced resize, frame-rate and color controls.
Open toolGIF Resizer
Resize every animated GIF frame while preserving its timing.
Open toolGIF Speed Changer
Speed up or slow down an animated GIF with accurate frame timing.
Open toolPDF tools
Create, combine, split, rotate and reorder PDFs.
Images to PDF
Arrange images and create a single downloadable PDF.
Open toolPDF OCR
Extract reliable English text from scanned or selectable PDF pages privately in your browser.
Open toolMerge PDF
Combine several PDF files in your chosen order.
Open toolSplit PDF
Extract ranges, individual pages or fixed-size groups.
Open toolRotate PDF
Rotate selected pages left, right or 180 degrees.
Open toolReorder PDF
Rearrange PDF pages with keyboard-friendly controls.
Open toolRemove PDF Pages
Select unwanted pages and create a PDF containing the rest.
Open toolExtract PDF Pages
Copy selected pages into one PDF or separate PDF files.
Open toolAdd PDF Page Numbers
Number selected pages with configurable placement and styling.
Open toolWatermark PDF
Apply a text or image watermark to selected PDF pages.
Open toolPDF to JPG or PNG
Render selected PDF pages as JPG or PNG images.
Open toolCrop PDF
Adjust the visible crop area of selected PDF pages.
Open toolBasic PDF Editor
Add text, images, shapes, drawings and highlights to a PDF.
Open toolFill PDF Forms
Complete supported fields in an existing interactive PDF form.
Open toolAdd a Visual Signature
Draw, type or upload a visual electronic signature.
Open toolView and Edit PDF Metadata
Review and update supported PDF document metadata.
Open toolAudio Tools
Edit, convert, improve, record, and manage audio files directly from your device.
Audio Converter
Convert MP3, WAV, M4A, AAC, OGG, Opus or FLAC audio to MP3 or WAV in your browser.
Open toolAudio Trimmer
Trim or cut a precise section of an audio file and export it as MP3 or WAV.
Open toolAudio Splitter
Split audio at one or more timestamps and download each part.
Open toolAudio Merger
Arrange compatible audio files and join them into one track.
Open toolAudio Volume Booster & Changer
Boost, reduce or mute audio volume with a preview before exporting locally.
Open toolAudio Speed Changer
Speed up or slow down audio locally with practical presets and a custom rate.
Open toolFade In and Fade Out
Add adjustable fade-in and fade-out effects to audio.
Open toolAudio Reverser
Reverse a short audio file entirely on your device.
Open toolMono and Stereo Converter
Mix stereo audio to mono or duplicate mono into stereo.
Open toolAudio Waveform Generator
Create and download a PNG waveform without uploading audio.
Open toolAudio Metadata Viewer
Inspect duration, format, sample rate and channel information.
Open toolVoice Recorder
Record, pause, preview and download audio in your browser.
Open toolAudio Normalizer
Adjust peak volume locally for more consistent playback.
Open toolVideo Tools
Trim, convert, resize, edit, and manage videos with simple browser-based tools.
Video to GIF
Create an animated GIF from an MP4, M4V, MOV or WebM clip.
Open toolVideo to Audio
Extract audio from MP4, M4V, MOV or WebM and save it as MP3 or WAV.
Open toolVideo Metadata Viewer
Inspect a video's duration, dimensions and available format details.
Open toolVideo Trimmer
Select a short section and export it locally in a browser-supported format.
Open toolVideo Resizer
Resize a video to a practical resolution entirely in your browser.
Open toolVideo Cropper
Center-crop a video to common landscape, portrait or square ratios locally.
Open toolVideo Rotator
Rotate a video by 90, 180 or 270 degrees on your device.
Open toolVideo Flipper
Mirror a video horizontally or vertically without uploading it.
Open toolMute Video
Create a silent copy of a video without sending it to a server.
Open toolVideo Thumbnail Generator
Choose a video frame and download it as PNG, JPEG or WebP.
Open toolVideo Frame Extractor
Extract a controlled number of frames at regular intervals.
Open toolScreen Recorder
Record a screen or window after you grant browser permission.
Open toolWebcam Recorder
Record camera and optional microphone input with a local preview.
Open toolSubtitle Toolkit
Edit, sync, clean, check, combine, split, and reuse captions for everyday publishing.
Subtitle Editor & Video Preview
Edit caption text and timing while checking it against a local video.
Open toolSubtitle Timing Fixer
Move every caption earlier or later to fix out-of-sync playback.
Open toolSubtitle Text Cleaner
Remove styling tags and tidy spacing before publishing captions.
Open toolSubtitle Delivery Check
Find invalid timing, empty cues, overlaps, and numbering problems.
Open toolMerge Subtitle Parts
Join captions from split recordings, lessons, or interview segments.
Open toolSplit Long Subtitles
Divide one caption file at an episode, lesson, or clip boundary.
Open toolSubtitle to Readable Transcript
Remove timestamps and export caption dialogue as clean plain text.
Open toolText tools
Organize and transform plain text in your browser.
Split Text
Separate text with a common or custom delimiter and keep every resulting segment.
Open toolCase Converter
Convert text between uppercase, lowercase, title, sentence, inverse and alternating case.
Open toolWord & Character Counter
Count words, characters, sentences, paragraphs and estimated reading time as you type.
Open toolText Cleaner
Combine safe whitespace, line break and character cleanup rules in one pass.
Open toolFind & Replace Text
Find literal text or regular expressions and replace the first or every match.
Open toolLine Sorter & Line Tools
Sort, reverse, trim, number, deduplicate or shuffle newline-separated text.
Open toolList Converter
Convert lists between newlines, commas, semicolons or a custom delimiter.
Open toolText Escape & HTML Encoder
Escape or unescape HTML entities and JSON or JavaScript strings without executing code.
Open toolSlug Generator
Turn a title into a clean, readable URL slug with a custom separator.
Open toolText Repeater
Repeat text with a chosen count and separator under a browser-safe output limit.
Open toolAdd Prefix or Suffix
Add text around the whole input, every line or every non-empty line.
Open toolDuplicate Line Detector & Remover
Count repeated lines and keep the first or last occurrence with case controls.
Open toolWhitespace Inspector
Reveal and count spaces, tabs, line breaks and hidden line-edge whitespace.
Open toolText Compare
Compare two text blocks line by line and review added, removed and changed lines.
Open toolRandomize & Reverse Text
Shuffle lines or words, reverse word order, or reverse characters safely.
Open toolQR & barcode tools
Create scan-ready QR codes and standard barcodes.
Developer Tools
Format, encode, generate and verify developer-friendly values.
JSON Formatter
Validate, format or minify JSON with clear syntax errors.
Open toolXML Formatter
Validate, indent or minify XML directly in your browser.
Open toolBase64 Encoder & Decoder
Encode Unicode text or decode standard, unpadded and URL-safe Base64.
Open toolURL Encoder & Decoder
Encode or decode URL components without sending them anywhere.
Open toolUUID Generator
Generate one or more cryptographically random UUID v4 values.
Open toolHash & Checksum Generator
Create SHA-256, SHA-384, SHA-512 or CRC32 values from text.
Open toolJWT Decoder & Inspector
Decode JWT headers and claims, inspect timestamps and check expiration locally.
Open toolUnix Timestamp Converter
Convert Unix seconds, milliseconds and ISO dates in your browser time zone.
Open toolURL & Query String Parser
Inspect URL parts and repeated query parameters without making a network request.
Open toolSecure Random String Generator
Create random alphanumeric, hexadecimal or Base64URL values with Web Crypto.
Open toolPassword Generator
Create strong, customizable passwords with cryptographically secure randomness.
Open toolCalculators
Calculate dates, percentages, conversions, prices and payments.
Standard Calculator
Handle everyday arithmetic, percentages, parentheses and common mathematical operations.
Open toolPercentage Calculator
Calculate percentages, ratios and percentage changes.
Open toolAge Calculator
Find an exact age in years, months and days.
Open toolDate Difference Calculator
Count the days and complete weeks between two dates.
Open toolTime Duration Calculator
Measure elapsed time and subtract an optional break.
Open toolUnit Converter
Convert common length, mass, temperature and volume units.
Open toolDiscount Calculator
Calculate savings, optional sales tax and the final discounted price.
Open toolCompound Interest Calculator
Estimate investment growth from a starting balance, monthly contributions and compound interest.
Open toolBMI Calculator
Calculate adult body mass index and view the standard informational weight category.
Open toolProfit Margin Calculator
Calculate gross profit, profit margin and markup from revenue and cost.
Open toolMalaysia Bank Loan Rate & Loan Calculator
Estimate a home budget from salary, compare payment-compatible Malaysian bank rates, and calculate repayments.
Open tool