SwiftTools
中文

Online tools that never see your files

Merge PDFs, compress images, convert formats, count words, run the numbers. Every SwiftTools tool does its work inside your own browser, so nothing you open ever leaves your device.

Browse all toolsHow it works

  • Files stay on your device

    Processing happens in your browser using JavaScript and WebAssembly. There is no upload step, because there is no server doing the work.

  • Free, no account

    No sign-up, no email, no daily limit, no "pro" tier holding the useful settings hostage. Open a tool and use it.

  • Nothing to wait in line for

    Static pages and no round trips to a server mean the tools open instantly — and an outage on our side cannot break your work.

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All tools

Grouped by what you are working with.

PDF

Merge PDFCombine several PDFs into one file, in whatever order you drag them into.Split PDFPull a page range out of a PDF, or break one file into many.
Compress PDFComing soonShrink a PDF for email or upload limits by re-encoding its embedded images.
PDF to JPGComing soonRender each PDF page to a PNG or JPG image at the resolution you pick.
JPG to PDFComing soonTurn photos and scans into a single PDF, one image per page.
Organize PDFComing soonReorder, rotate and delete pages from a PDF you already have.
Watermark PDFComing soonStamp text or a logo across every page, plus optional page numbers.

Images

Compress ImageCut file size with a quality slider, and see the result before you save.
Resize ImageComing soonScale by pixels or percentage, with the aspect ratio optionally locked.
Convert ImageConvert between PNG, JPG, WebP and HEIC without a round trip to a server.
Crop ImageComing soonCrop to a free selection or a fixed ratio such as 1:1 or 16:9.
Remove BackgroundComing soonCut out the subject with an on-device model — the image is never uploaded.
Image to Base64Coming soonGet a data URI or raw Base64 string ready to paste into CSS or HTML.

Text & code

Word CounterCount words, characters and sentences, with reading time and keyword density.
Case ConverterComing soonSwitch between UPPER, lower, Title, Sentence and camelCase.
JSON FormatterPretty-print, minify and validate JSON, with the exact error position.
Base64 EncoderComing soonEncode and decode Base64, including correct handling of UTF-8 text.
URL EncoderComing soonPercent-encode and decode URLs, query strings and form data.
QR Code GeneratorGenerate a QR code for a link, text or Wi-Fi credential, then download it.
QR Code ScannerComing soonRead a QR code from an image or from your camera, decoding locally.
Password GeneratorRandom passwords from a cryptographically secure source, with a strength readout.
Hash GeneratorComing soonCompute SHA-1, SHA-256 and SHA-512 digests to verify a file or a string.
Timestamp ConverterComing soonConvert between Unix timestamps and readable dates, in any time zone.
Color ConverterComing soonConvert between HEX, RGB, HSL and HSV, with a contrast checker.
UUID GeneratorComing soonGenerate random v4 UUIDs in bulk, with case and format options.

Calculators

Mortgage CalculatorMonthly payment, total interest and a full amortisation schedule.
Loan CalculatorComing soonWork out repayments for any fixed-rate loan, with extra-payment scenarios.
Auto Loan CalculatorComing soonInclude trade-in value, down payment and sales tax in the real cost.
Compound Interest CalculatorComing soonProject savings growth with regular contributions and any compounding frequency.
Salary CalculatorComing soonTurn a gross salary into take-home pay after tax and deductions.
Pension CalculatorEstimate your retirement income from contributions, years of service and payout age.

Why local processing matters

Most online converters upload your file to a server, keep it for a while, and hand you back a link. That is a reasonable design for a public photo, and a bad one for a passport scan, a signed contract, or a spreadsheet of customer names.

SwiftTools is built the other way around. The page you load contains the whole tool: the PDF parser, the image encoder, the arithmetic. Your browser reads the file from your disk, works on it in memory, and writes the result back to your downloads folder. Closing the tab wipes the working copy. There is no queue, no retention window, and no copy of your file sitting on a machine you do not control.