diff --git a/cli/cli.go b/cli/cli.go
index a923d95..7e9def8 100644
--- a/cli/cli.go
+++ b/cli/cli.go
@@ -87,16 +87,17 @@ func Run(args []string, tty terminal.Terminal) int {
 		}()
 
 		if *dumpPem {
-			err = lib.ReadAsPEMFromFiles(files, *dumpType, tty.ReadPassword, func(block *pem.Block) error {
+			err = lib.ReadAsPEMFromFiles(files, *dumpType, tty.ReadPassword, func(block *pem.Block, format string) error {
 				block.Headers = nil
 				return pem.Encode(stdout, block)
 			})
 		} else {
-			err = lib.ReadAsX509FromFiles(files, *dumpType, tty.ReadPassword, func(cert *x509.Certificate, err error) error {
+			err = lib.ReadAsX509FromFiles(files, *dumpType, tty.ReadPassword, func(cert *x509.Certificate, format string, err error) error {
 				if err != nil {
 					return fmt.Errorf("error parsing block: %s\n", strings.TrimSuffix(err.Error(), "\n"))
 				} else {
 					result.Certificates = append(result.Certificates, cert)
+					result.Formats = append(result.Formats, format)
 				}
 				return nil
 			})
@@ -107,6 +108,7 @@ func Run(args []string, tty terminal.Terminal) int {
 			} else {
 				for i, cert := range result.Certificates {
 					fmt.Fprintf(stdout, "** CERTIFICATE %d **\n", i+1)
+					fmt.Fprintf(stdout, "Input Format: %s\n", result.Formats[i])
 					fmt.Fprintf(stdout, "%s\n\n", lib.EncodeX509ToText(cert, terminalWidth, *verbose))
 				}
 			}
@@ -156,6 +158,7 @@ func Run(args []string, tty terminal.Terminal) int {
 
 			for i, cert := range result.Certificates {
 				fmt.Fprintf(stdout, "** CERTIFICATE %d **\n", i+1)
+				fmt.Fprintf(stdout, "Input Format: %s\n", result.Formats[i])
 				fmt.Fprintf(stdout, "%s\n\n", lib.EncodeX509ToText(cert, terminalWidth, *verbose))
 			}
 			lib.PrintVerifyResult(stdout, *result.VerifyResult)
@@ -176,7 +179,7 @@ func Run(args []string, tty terminal.Terminal) int {
 		defer file.Close()
 
 		chain := []*x509.Certificate{}
-		err = lib.ReadAsX509FromFiles([]*os.File{file}, *verifyType, tty.ReadPassword, func(cert *x509.Certificate, err error) error {
+		err = lib.ReadAsX509FromFiles([]*os.File{file}, *verifyType, tty.ReadPassword, func(cert *x509.Certificate, format string, err error) error {
 			if err != nil {
 				return err
 			} else {
diff --git a/cli/cli_test.go b/cli/cli_test.go
index f4b7d98..295f328 100644
--- a/cli/cli_test.go
+++ b/cli/cli_test.go
@@ -42,6 +42,7 @@ t/DtcM/GpAhBbLP9Tk7kPB41v5fRIxVDo50Iz/qvkr37pQ4RsejSFg==
 `
 
 const expectedVerbose string = `** CERTIFICATE 1 **
+Input Format: PEM
 Serial: 4096
 Valid: 2017-07-19 16:50 UTC to 2017-07-29 16:50 UTC
 Signature: SHA256-RSA
diff --git a/lib/certs.go b/lib/certs.go
index fb203fd..f75c5ce 100644
--- a/lib/certs.go
+++ b/lib/certs.go
@@ -88,7 +88,7 @@ func errorFromErrors(errs []error) error {
 // data may be in plain-text PEM files, DER-encoded certificates or PKCS7
 // envelopes, or PKCS12/JCEKS keystores. All inputs will be converted to PEM
 // blocks and passed to the callback.
-func ReadAsPEMFromFiles(files []*os.File, format string, password func(string) string, callback func(*pem.Block) error) error {
+func ReadAsPEMFromFiles(files []*os.File, format string, password func(string) string, callback func(*pem.Block, string) error) error {
 	var errs []error
 	for _, file := range files {
 		reader := bufio.NewReaderSize(file, 4)
@@ -109,7 +109,7 @@ func ReadAsPEMFromFiles(files []*os.File, format string, password func(string) s
 // be in plain-text PEM files, DER-encoded certificates or PKCS7 envelopes, or
 // PKCS12/JCEKS keystores. All inputs will be converted to PEM blocks and
 // passed to the callback.
-func ReadAsPEM(readers []io.Reader, format string, password func(string) string, callback func(*pem.Block) error) error {
+func ReadAsPEM(readers []io.Reader, format string, password func(string) string, callback func(*pem.Block, string) error) error {
 	errs := []error{}
 	for _, r := range readers {
 		reader := bufio.NewReaderSize(r, 4)
@@ -130,7 +130,7 @@ func ReadAsPEM(readers []io.Reader, format string, password func(string) string,
 // inputs. Input data may be in plain-text PEM files, DER-encoded certificates
 // or PKCS7 envelopes, or PKCS12/JCEKS keystores. All inputs will be converted
 // to X.509 certificates (private keys are skipped) and passed to the callback.
-func ReadAsX509FromFiles(files []*os.File, format string, password func(string) string, callback func(*x509.Certificate, error) error) error {
+func ReadAsX509FromFiles(files []*os.File, format string, password func(string) string, callback func(*x509.Certificate, string, error) error) error {
 	errs := []error{}
 	for _, file := range files {
 		reader := bufio.NewReaderSize(file, 4)
@@ -151,7 +151,7 @@ func ReadAsX509FromFiles(files []*os.File, format string, password func(string)
 // data may be in plain-text PEM files, DER-encoded certificates or PKCS7
 // envelopes, or PKCS12/JCEKS keystores. All inputs will be converted to X.509
 // certificates (private keys are skipped) and passed to the callback.
-func ReadAsX509(readers []io.Reader, format string, password func(string) string, callback func(*x509.Certificate, error) error) error {
+func ReadAsX509(readers []io.Reader, format string, password func(string) string, callback func(*x509.Certificate, string, error) error) error {
 	errs := []error{}
 	for _, r := range readers {
 		reader := bufio.NewReaderSize(r, 4)
@@ -168,20 +168,20 @@ func ReadAsX509(readers []io.Reader, format string, password func(string) string
 	return errorFromErrors(errs)
 }
 
-func pemToX509(callback func(*x509.Certificate, error) error) func(*pem.Block) error {
-	return func(block *pem.Block) error {
+func pemToX509(callback func(*x509.Certificate, string, error) error) func(*pem.Block, string) error {
+	return func(block *pem.Block, format string) error {
 		switch block.Type {
 		case "CERTIFICATE":
 			cert, err := x509.ParseCertificate(block.Bytes)
-			return callback(cert, err)
+			return callback(cert, format, err)
 		case "PKCS7":
 			certs, err := pkcs7.ExtractCertificates(block.Bytes)
 			if err == nil {
 				for _, cert := range certs {
-					return callback(cert, nil)
+					return callback(cert, format, nil)
 				}
 			} else {
-				return callback(nil, err)
+				return callback(nil, format, err)
 			}
 		case "CERTIFICATE REQUEST":
 			fmt.Println(red.SprintfFunc()("warning: certificate requests are not supported"))
@@ -191,19 +191,20 @@ func pemToX509(callback func(*x509.Certificate, error) error) func(*pem.Block) e
 }
 
 // readCertsFromStream takes some input and converts it to PEM blocks.
-func readCertsFromStream(reader io.Reader, filename string, format string, password func(string) string, callback func(*pem.Block) error) error {
+func readCertsFromStream(reader io.Reader, filename string, format string, password func(string) string, callback func(*pem.Block, string) error) error {
 	headers := map[string]string{}
 	if filename != "" && filename != os.Stdin.Name() {
 		headers[fileHeader] = filename
 	}
 
-	switch strings.TrimSpace(format) {
+	format = strings.TrimSpace(format)
+	switch format {
 	case "PEM":
 		scanner := pemScanner(reader)
 		for scanner.Scan() {
 			block, _ := pem.Decode(scanner.Bytes())
 			block.Headers = mergeHeaders(block.Headers, headers)
-			err := callback(block)
+			err := callback(block, format)
 			if err != nil {
 				return err
 			}
@@ -217,7 +218,7 @@ func readCertsFromStream(reader io.Reader, filename string, format string, passw
 		x509Certs, err0 := x509.ParseCertificates(data)
 		if err0 == nil {
 			for _, cert := range x509Certs {
-				err := callback(EncodeX509ToPEM(cert, headers))
+				err := callback(EncodeX509ToPEM(cert, headers), format)
 				if err != nil {
 					return err
 				}
@@ -227,7 +228,7 @@ func readCertsFromStream(reader io.Reader, filename string, format string, passw
 		p7bBlocks, err1 := pkcs7.ParseSignedData(data)
 		if err1 == nil {
 			for _, block := range p7bBlocks {
-				err := callback(pkcs7ToPem(block, headers))
+				err := callback(pkcs7ToPem(block, headers), format)
 				if err != nil {
 					return err
 				}
@@ -246,7 +247,7 @@ func readCertsFromStream(reader io.Reader, filename string, format string, passw
 		}
 		for _, block := range blocks {
 			block.Headers = mergeHeaders(block.Headers, headers)
-			err := callback(block)
+			err := callback(block, format)
 			if err != nil {
 				return err
 			}
@@ -259,7 +260,7 @@ func readCertsFromStream(reader io.Reader, filename string, format string, passw
 		}
 		for _, alias := range keyStore.ListCerts() {
 			cert, _ := keyStore.GetCert(alias)
-			err := callback(EncodeX509ToPEM(cert, mergeHeaders(headers, map[string]string{nameHeader: alias})))
+			err := callback(EncodeX509ToPEM(cert, mergeHeaders(headers, map[string]string{nameHeader: alias})), format)
 			if err != nil {
 				return err
 			}
@@ -277,12 +278,12 @@ func readCertsFromStream(reader io.Reader, filename string, format string, passw
 				return fmt.Errorf("problem reading key: %s\n", err)
 			}
 
-			if err := callback(block); err != nil {
+			if err := callback(block, format); err != nil {
 				return err
 			}
 
 			for _, cert := range certs {
-				if err = callback(EncodeX509ToPEM(cert, mergedHeaders)); err != nil {
+				if err = callback(EncodeX509ToPEM(cert, mergedHeaders), format); err != nil {
 					return err
 				}
 			}
diff --git a/lib/verify.go b/lib/verify.go
index c4635a7..8587a5b 100644
--- a/lib/verify.go
+++ b/lib/verify.go
@@ -47,6 +47,7 @@ type SimpleVerification struct {
 
 type SimpleResult struct {
 	Certificates           []*x509.Certificate `json:"certificates"`
+	Formats                []string
 	VerifyResult           *SimpleVerification `json:"verify_result,omitempty"`
 	TLSConnectionState     *tls.ConnectionState
 	CertificateRequestInfo *tls.CertificateRequestInfo
@@ -94,7 +95,7 @@ func caBundle(caPath string) (*x509.CertPool, error) {
 			// TODO: The JDK trust store ships with this password.
 			return "changeit"
 		},
-		func(cert *x509.Certificate, err error) error {
+		func(cert *x509.Certificate, format string, err error) error {
 			if err != nil {
 				return fmt.Errorf("error parsing CA bundle: %s\n", err)
 			} else {
diff --git a/tests/dump-cert-chain-to-text.t b/tests/dump-cert-chain-to-text.t
index da669c8..94cf5f4 100644
--- a/tests/dump-cert-chain-to-text.t
+++ b/tests/dump-cert-chain-to-text.t
@@ -109,6 +109,7 @@ Dump a live cert chain (squareup-chain.crt)
 
   $ certigo --verbose dump squareup-chain.crt
   ** CERTIFICATE 1 **
+  Input Format: PEM
   Serial: 260680855742043049380997676879525498489
   Valid: 2016-07-15 20:15 UTC to 2017-07-31 20:45 UTC
   Signature: SHA256-RSA
@@ -148,6 +149,7 @@ Dump a live cert chain (squareup-chain.crt)
   \tgosq.co, www.gosq.co (esc)
   
   ** CERTIFICATE 2 **
+  Input Format: PEM
   Serial: 30215777750102225331854468774
   Valid: 2014-12-15 15:25 UTC to 2030-10-15 15:55 UTC
   Signature: SHA256-RSA
@@ -176,6 +178,7 @@ Dump a live cert chain (squareup-chain.crt)
   \tServer Auth (esc)
   
   ** CERTIFICATE 3 **
+  Input Format: PEM
   Serial: 1372799044
   Valid: 2014-09-22 17:14 UTC to 2024-09-23 01:31 UTC
   Signature: SHA256-RSA
diff --git a/tests/dump-leaf-to-not-verbose.t b/tests/dump-leaf-to-not-verbose.t
index 6962d30..06cefe8 100644
--- a/tests/dump-leaf-to-not-verbose.t
+++ b/tests/dump-leaf-to-not-verbose.t
@@ -28,6 +28,7 @@ Dump an example certificate (example-leaf.crt)
 
   $ certigo dump example-leaf.crt
   ** CERTIFICATE 1 **
+  Input Format: PEM
   Valid: 2016-06-10 22:14 UTC to 2023-04-15 22:14 UTC
   Subject:
   \tC=US, ST=CA, O=certigo, OU=example, CN=example-leaf (esc)
diff --git a/tests/dump-leaf-to-text.t b/tests/dump-leaf-to-text.t
index 1324280..a47a1cc 100644
--- a/tests/dump-leaf-to-text.t
+++ b/tests/dump-leaf-to-text.t
@@ -28,6 +28,7 @@ Dump an example certificate (example-leaf.crt)
 
   $ certigo --verbose dump example-leaf.crt
   ** CERTIFICATE 1 **
+  Input Format: PEM
   Serial: 15384458167827828543
   Valid: 2016-06-10 22:14 UTC to 2023-04-15 22:14 UTC
   Signature: SHA256-RSA
diff --git a/tests/dump-name-constraints-to-text.t b/tests/dump-name-constraints-to-text.t
index 171a1a7..7f1f6da 100644
--- a/tests/dump-name-constraints-to-text.t
+++ b/tests/dump-name-constraints-to-text.t
@@ -55,6 +55,7 @@ Dump an example certificate with name constraints (example-name-constraints.crt)
 
   $ certigo --verbose dump example-name-constraints.crt
   ** CERTIFICATE 1 **
+  Input Format: PEM
   Serial: 13776854720312847553
   Valid: 2017-08-18 19:48 UTC to 2024-06-22 19:48 UTC
   Signature: SHA256-RSA (self-signed)
@@ -88,6 +89,7 @@ Dump an example certificate with name constraints (example-name-constraints.crt)
   \tCert Sign (esc)
   
   ** CERTIFICATE 2 **
+  Input Format: PEM
   Serial: 0
   Valid: 2011-12-06 13:49 UTC to 2031-12-01 13:49 UTC
   Signature: SHA1-RSA (self-signed)
diff --git a/tests/dump-small-key-to-text.t b/tests/dump-small-key-to-text.t
index 7525807..05d95be 100644
--- a/tests/dump-small-key-to-text.t
+++ b/tests/dump-small-key-to-text.t
@@ -21,6 +21,7 @@ Dump an example certificate (example-leaf.crt)
 
   $ certigo --verbose dump example-small-key.crt
   ** CERTIFICATE 1 **
+  Input Format: PEM
   Serial: 14381893493177441266
   Valid: 2016-06-10 22:14 UTC to 2023-04-15 22:14 UTC
   Signature: SHA256-RSA (self-signed)
diff --git a/tests/dump-spiffe-cert-to-text.t b/tests/dump-spiffe-cert-to-text.t
index 1df4055..2318740 100644
--- a/tests/dump-spiffe-cert-to-text.t
+++ b/tests/dump-spiffe-cert-to-text.t
@@ -35,6 +35,7 @@ Dump a SPIFFE example certificate (example-spiffe.crt)
 
   $ certigo --verbose dump example-spiffe.crt
   ** CERTIFICATE 1 **
+  Input Format: PEM
   Serial: 4096
   Valid: 2017-07-19 16:50 UTC to 2017-07-29 16:50 UTC
   Signature: SHA256-RSA